Underground performance

Underground performance Old school values and honesty applied to new technologies without huge price mark ups

Only O.G's will remember.
04/13/2026

Only O.G's will remember.

Some cross drilled crankshaft goodness wonder what combination this is going to go in? Any guesses
04/11/2026

Some cross drilled crankshaft goodness wonder what combination this is going to go in? Any guesses

Oh my! la sleeves to the rescue.
04/08/2026

Oh my! la sleeves to the rescue.

04/07/2026

Coming soon by the end of this month will be rolling out 4 700+whp STI's. A couple are old builds in progress a couple newer finally. Can't wait complete custom builds from the crank all the way to the valve covers. Just playing with them grown up Legos again.

Three in process and four more to go after but I don't build Subarus. I just play with grown up Lego's
04/06/2026

Three in process and four more to go after but I don't build Subarus. I just play with grown up Lego's

So your tuner specializes in Subarus does he. I bet
03/16/2026

So your tuner specializes in Subarus does he. I bet

Who tuned your fa20 wrx?
03/01/2026

Who tuned your fa20 wrx?

Taking care of a customer that had some undesirable material in his oil change. had no issue with him bringing me the sh...
08/14/2025

Taking care of a customer that had some undesirable material in his oil change. had no issue with him bringing me the short block that I had hand built. Did a tear down inspect and verify if there is a failure under warranty. Found no issues other than some slight bearing scuffing of the Dry Film. The best part about having an engine built in house by hand is it is warrantied in house. Take accountability for your work and make sure customers are happy

So you installed some goodies with your buddies. And then had it tuned and it didn't go so well. Get a pretune inspectio...
05/28/2025

So you installed some goodies with your buddies. And then had it tuned and it didn't go so well. Get a pretune inspection. Also just because it has a fancy name on it doesn't mean it won't fail just like the factory part.

Semi-built JDM 2.0l cylinder heads. Gsc beehive springs. Gsc stainless steel valves. Gsc 272 cams. Viton seals
04/16/2025

Semi-built JDM 2.0l cylinder heads. Gsc beehive springs. Gsc stainless steel valves. Gsc 272 cams. Viton seals

3 inch lift and rear air leveling system.
03/17/2025

3 inch lift and rear air leveling system.

Damn Chevy you're really getting me to want a new truck. Oh by the way underground performance doesn't just build Subaru...
03/16/2025

Damn Chevy you're really getting me to want a new truck. Oh by the way underground performance doesn't just build Subarus but we do specialize in them. Just a little bit of suspension work and re-gearing

Address

541 Commerce Road
Orem, UT
84058

Opening Hours

Monday 8am - 6pm
Tuesday 8am - 6pm
Wednesday 8am - 6pm
Thursday 8am - 6pm
Friday 8am - 6pm

Telephone

(801) 921-6277

Website

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