Underground performance

Underground performance

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04/11/2026

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

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.

Photos from Underground performance's post 04/16/2025

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

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