Half vs full exhaust system maybe? A full system with big bore headers properly tuned can get you close to 10% more on a stock motor a half system would be a lot less. A full system will also get you loads more mid range torque which is what really matters in normal road riding conditions as previously pointed out.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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