If you've ever tried to research PPE Diesel online, you've probably hit the same wall every diesel shopper hits: the brand is everywhere, the product is excellent, and the marketing is — let's just say modest. PPE doesn't shout. They engineer. They build. They ship parts that make Duramaxes and Cummins trucks work harder, last longer, and stop ending up on flatbeds. And they leave the marketing to the next guy.

That's why we stock them. Pacific Performance Engineering is the brand we keep recommending when customers want quality without flash, durability without compromise, and parts that work the way they were supposed to. Here's the no-fluff guide to what PPE actually makes, why their stuff is worth buying, and which PPE pieces belong on your truck. Want it bundled? Send us your build.

Who is PPE Diesel?

Pacific Performance Engineering — PPE for short — has been engineering and manufacturing diesel-truck performance and reliability parts since the late 1990s out of Fullerton, California. They focus heavily on the GM Duramax platform (where they have arguably the deepest aftermarket catalog) and extend into Cummins and Power Stroke applications across their broader product line.

What separates PPE from the catalog brands: they actually engineer the parts they sell. Their transmission components, their lift pumps, their monitoring solutions, their exhaust manifolds — these are designed by engineers who understand the platform-specific challenges, manufactured to spec, and sold without the marketing fluff that drowns out a lot of the diesel aftermarket. It's the kind of brand that owners discover, install, then quietly recommend to every other diesel owner they meet.

The PPE lineup, decoded

PPE's catalog is wide. Here's the cheat sheet on what they actually make — focusing on the parts that matter most.

PPE Transmission Components

This is where PPE has built much of their reputation. Their built transmissions for Allison 1000 (Duramax), 68RFE (Ram Cummins), and other platforms are full drop-in upgrades that take the factory unit's weak points and engineer them out. Their billet flexplates, billet torque converters, and valve body upgrades are popular components that make a stock-or-rebuilt transmission live behind tuning and tow loads.

Browse the transmission & clutch selection for the PPE pieces alongside the BD Diesel and South Bend options — see our BD Diesel guide and South Bend guide for the broader picture.

PPE Lift Pumps and Fuel System Hardware

PPE makes lift pump systems that compete directly with FASS and AirDog. Strong filtration, frame-mounted convenience, application-specific kits, and a build quality that earns repeat business. If you're picking between PPE and FASS or AirDog, the answer is platform-dependent and use-case dependent — all three are quality choices. See our broader best diesel lift pumps guide for the head-to-head.

PPE Race Exhaust Manifolds

PPE's high-flow exhaust manifolds for Duramax and Cummins applications address the same problem BD Diesel addresses — cracked stock manifolds — with a different engineering approach. Higher flow, more durable casting, and built for trucks that work hard. A popular alternative to BD's offerings depending on the specific platform and the truck's power level.

PPE Monitors and Gauges

PPE's monitor lineup includes both standalone gauges and integrated multi-PID displays. For owners who want PPE-specific monitoring without the broader Edge or Banks ecosystems, PPE's solutions fit cleanly into a build that's already running their transmission and fuel-system parts.

PPE Engine Components and Hard Parts

Beyond the headline categories, PPE makes hard parts that address specific platform weak points — oil cooler upgrades, EGR cooler solutions, fuel system flow-through components, and supporting hardware for built engines. Their catalog runs deeper than first-time PPE shoppers expect.

PPE Coolant and Fluid System Parts

High-capacity coolant tanks, performance thermostats, upgraded radiators, and related cooling system parts that get serious work-truck and tow-rig owners through the hardest pulls. Cooling system upgrades aren't glamorous, but they're exactly the kind of thing that keeps a truck on the road when others are pulled over with steam coming out from under the hood.

The Duramax connection: why PPE owns this platform

If you own a GM Duramax — LB7 through L5P — there's a good reason PPE is one of the most-recommended brands for your truck. PPE's Duramax catalog is the deepest in the industry, with components for the Allison transmission, the high-pressure fuel system, the cooling system, the exhaust side, and beyond. For Duramax owners, PPE isn't an alternative — it's a foundational brand alongside Banks, BD, and S&B.

That's not to say PPE only makes Duramax parts — their Cummins and Power Stroke offerings are strong too. But the Duramax is where they have the deepest engineering investment. Browse the Duramax parts selection to see where PPE fits in your build.

PPE platform by platform

GM Duramax (LB7 through L5P)

PPE's home turf. Allison transmission components (valve bodies, billet flexplates, complete builds), high-pressure fuel system parts, exhaust manifolds, coolant tanks, and monitors all cover the Duramax range comprehensively. Pair with the broader Duramax catalog and read our LB7 injector failure guide (coming soon) for context on the platform's weak spots.

Ram 5.9 & 6.7 Cummins

PPE's 68RFE transmission components and lift pump options are the standouts on the Cummins side. Their transmission line is a quality alternative to BD Diesel and similar brands; their lift pump kits are a viable alternative to FASS depending on the specific application. Browse Cummins parts.

Ford Power Stroke

PPE's Power Stroke offerings cover specific components rather than the broad lineup they offer for Duramax — but where they do compete, their parts are quality. Match against the broader Power Stroke catalog and see what fits your specific platform.

Why PPE earns the spot in builds

The aftermarket diesel space has a thousand brands competing for attention with marketing. PPE competes differently — they engineer, they manufacture, they stand behind what they sell. The trade-off is they don't get as much marketing-driven attention as some of the louder brands. The flip side is owners who actually use the products are quietly running them in builds across every diesel community.

Why we keep stocking PPE:

• Engineering depth on the Duramax side that exceeds most of the catalog brands.
• Built transmissions that hold up to real tuning and real tow loads.
• Quality manufacturing across their hard parts catalog.
• Customer support that's actually accessible — the kind that increasingly doesn't exist in the diesel space.
• Price-to-quality ratio that's often better than the louder brands' equivalent products.

None of that is sexy. All of it matters when you're building a truck you intend to actually drive.

Common PPE buying scenarios

"I'm building an Allison-equipped Duramax"

PPE's Allison lineup is one of the deepest in the diesel aftermarket. Their billet flexplates, billet torque converters, valve body upgrades, and complete built units are the foundation of countless Duramax builds. Pair with the rest of the transmission selection.

"I need a lift pump and I'm comparing options"

PPE's lift pumps are a quality alternative to FASS and AirDog. The specific recommendation depends on your platform, power goals, and what supporting hardware you're running. See our comparison in the best diesel lift pumps guide.

"My exhaust manifold is cracked"

PPE's race exhaust manifolds compete head-to-head with BD's Pulse line. Both are excellent solutions to the cracked-manifold problem on Duramax and Cummins. The specific pick depends on your platform and your power goals — see also our BD Diesel guide for the BD side.

"I want monitoring without buying into the Edge or Banks ecosystem"

PPE's standalone monitor solutions are a clean choice for owners who want PPE-platform integration or who already run other PPE parts. Pair them with the rest of the build.

Stacking PPE with the rest of your build

PPE works well as a build foundation, particularly on the Duramax side. The high-value pairings:

• S&B cold air intake for the air side — see the S&B guide.
• FASS or PPE lift pump for clean fuel supply.
• S&S CP4 protection on LML or L5P Duramaxes (and any CP4-equipped truck) — see the CP4 disaster prevention guide.
• Dynomite Diesel injectors when the factory units are aging — see the Dynomite guide.
• BD Diesel or PPE built transmission when you're pushing power into the Allison or 68RFE.
• Edge CTS3 or Banks iDash for monitoring across the build — see the Edge CTS3 guide and Banks Power guide.

PPE's strength is in the durability layer — built transmissions, cooling system upgrades, fuel system components. It's the kind of brand you bolt onto a truck you intend to actually drive for the next 200,000 miles.

Install: shop work, mostly

PPE's bigger items — built transmissions, race manifolds, lift pump installs — are real wrench jobs. The smaller items (monitors, coolant tanks, supporting hardware) are friendly DIY installs. Rough categorization:

• Monitors and gauges: Saturday morning DIY, basic tools.
• Coolant tanks and cooling parts: half-day with a lift.
• Lift pump install: a weekend for an experienced DIYer.
• Exhaust manifold replacement: half-day to full day with a lift; requires turbo removal.
• Built transmission install: trans-out work; usually a shop visit.

Most of PPE's lineup is the kind of work that benefits from a lift and the right tools. If you're doing one big PPE install — say, dropping a built Allison into a Duramax — bundle the related work at the same time. Drop it off and our techs will handle it.

The PPE engineering story (and why it matters)

The diesel aftermarket has plenty of companies that source parts from overseas, put a sticker on the box, and resell at a margin. PPE is the opposite end of that spectrum. They engineer their parts in-house at their California facility, manufacture to spec, and stand behind what they ship. That's a much harder business model than rebranding — and it shows in the products.

For example, look at PPE's Allison-platform engineering. The Allison 1000 has been around since 2001, and most of the aftermarket "Allison upgrades" you see are off-the-shelf valve bodies or factory-rebuilt converters. PPE's Allison line is different — they designed their billet flexplate around the failure modes they observed in the field, designed their valve body around the apply-circuit weaknesses they measured in dyno testing, and designed their billet torque converter around the input shaft loading they document. That's the difference between "Allison parts" and "Allison engineering."

You see the same pattern across their broader catalog. The race exhaust manifolds are designed around the specific casting and stud failure modes the platforms exhibit. The lift pump systems are engineered around the supply-side challenges of each application. That kind of platform-specific work isn't free or fast — but it's why owners running PPE parts tend to keep recommending them.

How to navigate the PPE catalog

If you've never shopped PPE before, the catalog can be intimidating. Quick navigation tips:

• Identify your platform first. The PPE catalog organizes heavily by truck — LB7, LLY, LBZ, LMM, LML, L5P on the Duramax side; 5.9 and 6.7 on the Cummins side; specific year ranges on the Power Stroke side. Start by filtering to your truck.
• Pick the system you're addressing. Transmission, fuel system, cooling, exhaust, monitoring — PPE organizes by system, and most decisions come down to "which system am I working on right now?"
• Compare PPE to the alternatives within your system. PPE's transmission parts sit alongside BD's; their lift pumps sit alongside FASS's; their manifolds sit alongside BD's. Pick based on application-specific fit and price.
• Ask if you're not sure. The PPE catalog has depth that's hard to fully understand from a product page. Our team installs their stuff constantly — send us your build and we'll spec it.

Common questions on PPE

Is PPE a quality brand?

Yes — among the highest-quality diesel aftermarket brands, particularly on the Duramax side. Their engineering depth, manufacturing quality, and customer support are why they keep getting recommended despite their relatively quiet marketing.

What's PPE best known for?

Allison transmission components for the Duramax — that's the area where their reputation is deepest. Their broader catalog (lift pumps, monitors, hard parts) extends well beyond Allison transmissions.

Is PPE a Duramax-only brand?

No, but the Duramax is where their catalog is deepest. They have strong Cummins and Power Stroke offerings as well, just with less depth than the Duramax side.

PPE vs BD Diesel vs Banks — which should I pick?

Each brand has its strengths. PPE excels on Duramax-specific engineering. BD excels on cracked-manifold fixes and built transmissions across platforms. Banks excels on the integrated ecosystem (intake, exhaust, tuning, monitoring). For most builds, you'll end up with parts from more than one of them depending on what each platform needs.

Can I install PPE parts myself?

Monitors, gauges, and smaller hard parts — yes, with basic tools. Built transmissions and major fuel-system work — most owners are smarter to hand to a shop. Ask us.

Does PPE make race-only parts?

Some of PPE's exhaust manifold and high-power components are race-oriented. Check the specific product designation; most of their lineup is street-legal for street applications, with race-only variants clearly marked.

How does PPE compare to BD Diesel for transmissions?

Both are quality. BD has slightly broader platform coverage (covering more Ford and gas-engine applications); PPE has arguably deeper Allison-specific engineering. For a Duramax owner shopping a built Allison, PPE is on the short list. For a Cummins owner shopping a 68RFE, BD is on the short list. Both work.

Are PPE built transmissions warrantied?

Yes — PPE's built transmissions carry manufacturer warranty terms. Specifics vary by product; check the current terms on the product page. Reputable builders all stand behind their work, and PPE is no exception.

Will PPE void my GM warranty?

Federal Magnuson-Moss prevents a manufacturer from voiding the entire warranty over an aftermarket part. They can only deny a specific claim if they can prove the aftermarket part caused that specific failure. PPE's engineering is generally favorable on this front (they're not breaking things). Consult your specific dealer relationship.

Where are PPE parts manufactured?

PPE manufactures the bulk of their engineered parts in-house at their California facility — that's a meaningful difference from a lot of the catalog brands that source overseas and rebadge.

Does PPE make EGR delete parts?

PPE focuses primarily on engineered durability and performance hardware — built transmissions, lift pumps, exhaust manifolds, monitors. Delete-class parts are a separate category we generally don't dive into for street use; see our broader EGR / emissions conversation in the upcoming guides on those topics.

The quiet diesel brand that builds the trucks you actually drive

The diesel aftermarket has plenty of brands competing for attention. PPE competes for results — built transmissions that don't slip, lift pumps that don't fail, exhaust manifolds that don't crack, and monitors that actually tell you what your truck is doing. That's not a marketing pitch; that's what they make.

Shop the full PPE collection at DNR Customs, browse the related transmission, fuel system, and cooling system categories where PPE shines, and when you're ready to spec the right PPE parts for your platform and your build — and bundle the install with whatever else the truck needs — request a quote. We'll get you set up right the first time, every time.