Fosth Performance
Share
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.
The store will be closed tomorrow and Saturday (6/5 & 6/6) business as usual at the track.
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.
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 🙌🏼
05/21/2026
New clutch installation on this mustang, fixed a few miscellaneous leaks for the customer as well
Sound up for the chop
04/19/2026
03/22/2026
Picked up a 6.2 for a customer build, thanks to Marc Vetter 💪🏽
03/22/2026
Long tube header installation for this 2020 ram 🙌🏼
02/27/2026
4r100 rebuild and installation for this 2003 Ford
02/24/2026
Another LS swap heading out the door, you don’t see very many of these on the road anymore
Click here to claim your Sponsored Listing.
Category
Contact the business
Website
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 |