Best Evo Exhaust Manifolds Made in the USA: STM Tuned, Full-Race, and ETS Compared

Three Brands, One Question: Which USA-Made Evo Manifold Is Right for Your Build?

Replacing the factory cast-iron manifold on a Mitsubishi Lancer Evolution is one of those decisions that looks simple until you start digging. The OEM piece is a twin-scroll design that actually flows reasonably well in stock-turbo applications — some shops will tell you to leave it alone until you’re past 400whp. But once you’re swapping turbos, chasing faster spool, or just tired of watching the factory manifold develop hairline cracks, the aftermarket opens up fast.

Three names come up consistently when Evo owners search for USA-made options: STM Tuned (Webster, NY), Full-Race Motorsports (Mesa, AZ), and Extreme Turbo Systems / ETS (Vancouver, WA). All three build domestically, all three carry lifetime warranties on their manifolds under normal use, and all three have real race pedigree behind them. But they approach the problem differently — and those differences matter depending on where your build is headed.

This article breaks down each option by material and construction method, turbo compatibility, fitment notes, and price tier, so you can make a decision based on data rather than forum hype.

STM Tuned: Hand-Fabricated, Built to Order, Covers Every Evo Generation

STM Tuned has been building Evo-specific parts since 2007 out of Webster, New York, and their manifold lineup is probably the widest of the three brands covered here. They offer options for Evo 4 through Evo X — stock replacement, standard placement T3, standard placement V-Band, forward-facing T3, and forward-facing V-Band configurations. That forward-facing design, first introduced by STM in 2008, places the turbo directly in front of the bumper vent opening, and has since logged 1/4-mile passes at 180+ mph on the same production manifold sold to customers.

Construction details are consistent across the lineup: Schedule 10 1.5" stainless steel runners, TIG-welded and back-purged in-house, with a mild steel head flange specifically chosen to prevent stud pull-out — a real-world failure point that gets overlooked in spec sheets. The Evo 7/8/9 stock replacement, for example, is a direct bolt-on for factory turbos and stock-frame upgrades including the FP Red, Green, Black, White, Zero, Zephyr, EF2, EF3, and Blouch models. The V-Band variants are flanged for Garrett Gen 2, Garrett/TiAL, and PTE V-Band housings, with a TiAL 44mm MVR wastegate flange.

For the Evo X, STM’s stock replacement manifold is TIG-welded from the same 1.5" Schedule 10 stainless and fits directly to factory-frame turbos including FP and Blouch models. Hand-blended transitions at the collector are a detail that separates it from manifolds that simply weld tubes to a flange and call it done.

One honest note on lead time: STM manifolds are built to order. Expect 2–4 weeks on most configurations, with ceramic coating adding another two weeks. Optional 2000°F high-temp ceramic coating is available across the lineup — useful if underhood temps are a concern on a street car. A lifetime warranty against manufacturing defects covers the original purchaser.

For anyone building a complete hot-side system, STM also sells full Hot Parts Kits for Evo 4/5/6 and Evo 7/8/9 that bundle the manifold with the matching downpipe and O2 housing, which removes the compatibility guesswork entirely. You can browse the full STM Evo manifold selection at mtuned.com.

Full-Race Motorsports: Robotic TIG, ProStock Fitment, Stock-Frame Focus

Full-Race built their reputation on the ProStock concept: a tubular stainless manifold that retains all factory ancillaries — O2 housing, downpipe, oil and coolant plumbing, charge pipes — while improving flow over the OEM cast piece. The construction method is notably different from STM’s hand-fabrication. Full-Race uses robotic TIG welding on thick-wall stainless steel, with CNC-ported head flanges and machined sealing surfaces. The argument for robotic welding is consistency across units; the argument against it is that it limits design flexibility compared to hand-built pieces.

For the Evo 4–9 4G63, Full-Race offers a ProStock tubular manifold designed as a direct plug-and-play replacement for the OEM cast unit. It fits Evo VI through IX and is aimed at stock-frame turbo setups. They also offer a T3 ProStreet variant that retains power steering, air conditioning, and stock radiator placement while accommodating larger T3-family turbines and TiAL 44mm wastegates — useful for street builds that need to keep creature comforts intact.

For the Evo X 4B11T, the Full-Race ProStock is designed to work with stock or stock-frame upgraded turbos up to the 550–600whp range, covering units like the Garrett Evo X 30R, Blouch/CBRD, FP Red, and FP Black. The ProStock design retains compatibility with all factory or aftermarket components including the O2 housing, downpipe, and coolant plumbing.

Full-Race also carries a lifetime manufacturer warranty on their manifolds. Pricing on the Evo X ProStock has historically landed around $1,099–$1,200 USD depending on retailer and configuration. The T3/T4 and EFR variants for the Evo X push higher, with some configurations listed above $1,300.

Where Full-Race fits: If you’re on a stock-frame turbo, want a direct bolt-on with no fabrication required, and prefer the consistency of robotic welding, Full-Race is a proven choice. The limitation is that their Evo lineup is narrower — they don’t cover the range of turbo configurations or Evo generations that STM does, and the forward-facing or large-frame V-Band builds aren’t really their territory.

ETS (Extreme Turbo Systems): Race-Proven, High-Power, Premium Price

ETS is based in Vancouver, Washington, and their Evo manifold work is oriented toward higher-power builds and dedicated race applications. Their Evo 4–9 lineup includes a Quick Spool manifold designed around Garrett G-series turbos (G25 for 450+ hp, G30 for 650+ hp, G35 for 850+ hp) and a T4 Twin Scroll stock-location manifold that suits dual external wastegates — either 2x Turbosmart 40mm or TiAL 38mm units.

The ETS Evo X kit features an equal-length manifold with a true merge collector, full 3" downpipe, and direct-routed wastegate dump. ETS claims this is the same kit used to run the world’s fastest Evo X quarter-mile pass. For the Evo 4–9, ETS markets their quick-spool manifold as the fastest-spooling option on the market for that platform, matched to water-cooled Garrett G-series technology.

All ETS manifolds are built in-house by the ETS team. Pricing reflects the race-focused positioning: the Evo 4–9 Quick Spool manifold starts around $1,873 USD, and the T4 Twin Scroll stock-location manifold runs approximately $2,067 USD at current retail. ETS carries a lifetime warranty on their manifolds, though it’s worth noting that the warranty period on manifolds that are wrapped or ceramic-coated drops to 90 days — a meaningful caveat if you’re planning to wrap for heat management.

ETS makes sense for builds chasing serious power numbers on dedicated race or time-attack cars. For street builds or mid-level turbo swaps, the price premium is harder to justify, and the dual-wastegate setup adds complexity that most street builds don’t need.

Side-by-Side Comparison

All three brands are legitimate, domestic manufacturers with race-proven designs. The differences come down to build philosophy, turbo configuration coverage, and where your power goals sit.

Which One Should You Buy?

If you’re running a stock-frame turbo on an Evo 7, 8, 9, or X and want a direct bolt-on with no fabrication headaches, both STM Tuned and Full-Race solve that problem cleanly. STM’s stock replacement manifolds for the Evo 7/8/9 and Evo X are direct bolt-ons for factory and popular stock-frame turbos, hand-built in-house with a mild steel head flange that addresses the stud pull-out issue the factory piece is prone to. Full-Race’s ProStock covers similar ground with robotic-weld consistency.

If you’re doing a large-frame turbo swap — moving to a V-Band or T3 flange with an external wastegate — STM’s lineup of standard placement and forward-facing manifolds covers more ground than the other two brands at this tier. The forward-facing configuration in particular is a platform-specific design that STM pioneered and has refined over nearly two decades of in-house testing.

If you’re building for maximum power on a dedicated race car, ETS’s quick-spool and twin-scroll manifolds are worth the premium. The dual external wastegate setup and equal-length collector design are optimized for the upper end of the power range, and the Garrett G-series compatibility makes them a natural pairing for big-power 4G63 builds.

For most Evo owners shopping for a USA-made manifold they can order online and trust for the long term, STM Tuned covers the widest range of configurations, generations, and turbo pairings — and the built-to-order model means each piece gets individual attention rather than coming off a shelf. You can also pair an STM manifold with matching downpipes, gaskets, and hardware from the same source, which simplifies the build considerably. Browse the full Evo manifold lineup and related hot-side parts at STM Tuned.