Fosth Performance
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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.
09/18/2026
Had a great time last weekend at Skagen Bash! Was cool to see a handful of the boats we had the chance to work on out there rippin’ 👌🏼
08/26/2026
Pretty cool build we got to finish up for our customer, he's taking this truck all the way to Puerto Rico!
Blueprint crate engine
Installation of all new trim pieces & some body panels
New engine harness, new AC wiring, custom stereo installation
New fuel tanks installed and wired in, new fuel lines + fittings
New posi rear end, rear disc brake conversion
New shocks
All new factory style gauges with tack retro fit
Lots of hours put into this one can't wait for the customer to enjoy it 🤙🏽
08/21/2026
Lots of work for this truck to look exactly the same! All new body mounts, tank relocation, all new fuel/AN lines, wired in a new Dakota digital dash, new tilt steering column, Installation of a new frame-mounted fuel filter, removal and installation of the differential, drum brake rebuild, and installation of new air shocks.
21’ commander ready to party
Sounds of summer, finished these 3 boats just in time for the 4th 🤙🏽
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 🤙
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
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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 |