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Monday 9am - 5pm Tuesday 9am - 5pm Wednesday 9am - 5pm Thursday 9am - 5pm Friday 9am - 5pm Saturday 9am - 5pm Sunday 9am - 5pm

NAS Performance

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Republic, MO
NAS Performance

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At NAS Performance, we specialize in high-performance naturally aspirated Subaru engines for NA4WD stage rally and track cars.

From purpose-built rally motors to custom Subaru builds, we deliver precision, reliability, and winning performance.

10/25/2026

EJ251R Longblock Assembly 🔥

A high-performance, naturally aspirated Subaru engine built on the EJ251 platform and specifically engineered for the demands of stage rally in the NA4WD class.

Designed to withstand the punishment of grueling rally competition, this proven engine package delivers the performance and durability needed to compete at the highest level. Many of the race teams we support have earned podium finishes running this setup!

Built for competition. Proven in rally. 🇺🇸

10/24/2026

UPDATE: EZ30 BAFFLES ARE SHIPPING NEXT WEEK! 🔥

Thanks everyone for your patience! We made one final tweak to further improve the design, and we’re excited to get these out the door.

Orders will be shipping worldwide next week! 🌎

10/21/2026

Custom 11.5:1 EZ30R pistons and custom reground NA profile cams 👀 We will now offer reground for mild builds. We also do full high effort builds with billet cams that delete AVLS for more aggressive profiles.

10/19/2026

I recently saw someone running this external wet-sump oil pump and thought this would be awesome to incorporate into some of our builds. I’ve wanted to experiment with a setup like this for years, but had never come across a standalone oil pump designed for this application.

Then I came across this offering from Peterson, and it looks like it could be exactly what I’ve been looking for!You are also able to dial in desired oil pressure on the side of the pump.

The goal would be to support higher engine speeds without the same concerns about oil pump cavitation, while keeping the system relatively simple compared to a full dry-sump setup. Definitely something I’m excited to explore for our future builds! Would something like this interest you? We could see it working well for EJ, FA, and H6 builds!

10/17/2026

Temps are dropping, so we got a fresh battery setup in one of the shop cars from MeLe Design Firm! 🥶🔋
We went with the MeLe 900 Series paired with a Full Throttle FT410 for a compact, lightweight setup tucked behind the passenger seat of our WRX wagon. Under the hood is a fully built stroker EJ207! 💪
Ready for the colder months! 🤙

10/13/2026

No days off. Lock in. No luck, all discipline. We got some race engines to build 💪

10/11/2026

Huge power EG33 heads hand ported, and chambers worked. They are ready for our all custom valvetrain! Stay tuned for updates!

10/10/2026

If you are at Subiefest, go check out one of our customers circle track racecar! Trenten is great dude! This has our EJ251R+ engine! (More aggressive cams than normal EJ251R)

10/08/2026

Custom EJ25 DOHC stroker rotating assembly. 🔥

12.0:1 compression super-light flat-top pistons, A-beam super-light steel rods, and a billet WPC/cryo-treated crankshaft with fully knife-edged counterweights.

Built for serious RPM—ready for 13mm cam lift and 9,000 RPM. 🤙

We’re always pushing the limits of what these Subaru engines can do. Innovation never stops.

Address

Republic, MO
65738

Opening Hours

Monday	9am - 5pm
Tuesday	9am - 5pm
Wednesday	9am - 5pm
Thursday	9am - 5pm
Friday	9am - 5pm
Saturday	9am - 5pm
Sunday	9am - 5pm

Website

http://nasperformance.com/

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