I put mine on the dyno before and after too and had similar results. Mine was with the manifolds too but did show gains from the mid-range at about circa 9bhp http://986forum.com/forums/performance-technical-chat/47555-tuned-modified-2000-boxster-s.html
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Current: 550 Spyder Anniversary- Carnewal exhaust - 100 cell cats - stainless manifolds - 4" underdrive pulley - poly gearbox mounts - rear lower alu brace - adjustable rear toe links
Sold: 986S - Zenith Blue - 18" Sport Classics - Black Zunsport grilles - Stainless silencer and manifolds - K&N panel - shortshift - M030 suspension - 75mm throttle body - custom 83mm intake - SmartTop - custom remap - MDS underdrive pulley
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