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I'd vote GPI, but admittedly I have no experience with TSP. My experience with GPI has been phenomenal (look at my GPI build thread). The team there is very personable and committed to maintaining the outstanding reputation that they have earned. I'm local to GPI and that helps with scheduling and face-to-face discussions but they are very accessible and responsive on here and other forums, facebook, etc.
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2010 2SS/RS A6. GPI SS3 VVT Cam, 228/246 / AFM Delete / Circle D 4C 36-3800 Stall / Stainless Works LTHs, High Flow Cats, X-pipe, Borla Pro XS Mufflers and Quad Tips / Vararam CAI / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod Intake Manifold/ Smith Bros. Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Melling 10355 Oil Pump / Powermaster XS Torque Starter / Derale Xmsn Cooler / 1LE Suspension Upgrade System / BMR Strut Tower Brace, Trailing Arms and Toe Rods / Powerbond 25% UDP / Mishimoto catch can / iDatalink Maestro.
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