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.

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
Picked up a 6.2 for a customer build, thanks to Marc Vetter 💪🏽
03/22/2026

Picked up a 6.2 for a customer build, thanks to Marc Vetter 💪🏽

Long tube header installation for this 2020 ram 🙌🏼
03/22/2026

Long tube header installation for this 2020 ram 🙌🏼

4r100 rebuild and installation for this 2003 Ford
02/27/2026

4r100 rebuild and installation for this 2003 Ford

Another LS swap heading out the door, you don’t see very many of these on the road anymore
02/24/2026

Another LS swap heading out the door, you don’t see very many of these on the road anymore

Today marks our 1st year in business! It's been a crazy first year to say the least, we're so grateful for every single ...
02/03/2026

Today marks our 1st year in business! It's been a crazy first year to say the least, we're so grateful for every single customer we've had- weather you bought parts from us, had us work on your vehicle, or even just came up to chat with us at the race track. Also would like to give a shoutout to all our vendors for working with our small family owned business as we wouldn't be able to supply our customers if it weren't for them. Thanks for taking the time to read & here's to many more great years🎉

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

Website

Alerts

Be the first to know and let us send you an email when Fosth Performance posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to Fosth Performance:

Shortcuts

Share

Category