Fosth Performance

Fosth Performance Small family business in Monroe Wa. Specialize in LS harnesses, engine modifications, motor swaps, full restorarions and much more.

Builds and swaps arent the only thing we offer! Just next door is our store front J2 Racing which has everypart you need.

07/08/2026

Sounds of summer, finished these 3 boats just in time for the 4th 🤙🏽

06/20/2026

Back to back Escalades, for this one we also installed a new 6L80, Tcase, & engine harness (thanks to Marc Vetter) machine work by Fastlane Motorsports!
If you wanna pimp out your wife's ride, give us a call 🤙

06/04/2026

The store will be closed tomorrow and Saturday (6/5 & 6/6) business as usual at the track.

To those who have served, to those currently serving and to those who did not make it back home. Thank you for protectin...
05/25/2026

To those who have served, to those currently serving and to those who did not make it back home. Thank you for protecting our families.

05/22/2026

Customer took absolutely no shortcuts on this build, crate engine, rebuilt 700r4, re geared axle, shortened driveline, new trans cooler, all new AN lines +fittings, etc. thank you Scott for trusting us 🙌🏼

New clutch installation on this mustang, fixed a few miscellaneous leaks for the customer as well
05/21/2026

New clutch installation on this mustang, fixed a few miscellaneous leaks for the customer as well

05/09/2026

Sound up for the chop

04/19/2026

Address

17239 Tye Street SE Suite D
Monroe, WA

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm
Saturday 9am - 6pm

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