We had the opportunity recently to tune a beautifully prepared 2006 WRX STI that was put together by GT Performance in Maryland. Among other goodies, the car sports a fully-built 2.6-liter block with custom dry-sump oiling, a built-up dog-gear transmission, a complete roll cage, and even air jacks. A Garrett GT35R turbocharger pushes air into a Cosworth intake manifold, and through Cosworth heads. The car made a whopping 565 whp on our dyno. Here's a look at an earlier dyno run -- a mere 500 whp:
Here's the car on the track at Summit Point:
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