Fosth Performance

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

10/09/2026

When the customer first brought this car in it did not run, after much discussion about the end goal and budgetary expenses we got a game plan together! Sounds pretty good and customer is happy

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 th...
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’ 👌🏼

Pretty cool build we got to finish up for our customer, he's taking this truck all the way to Puerto Rico!Blueprint crat...
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 🤙🏽

Lots of work for this truck to look exactly the same! All new body mounts, tank relocation, all new fuel/AN lines, wired...
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.

07/27/2026

21’ commander ready to party

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 🙌🏼

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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