Shorter exhaust tend to rob torque esp. from a v twin. Which is why Termi full systems have all those spaghetti manifolds to maintain and improve gas flow using negative pressure created by the other cylinder. And it works 10% more torque/power on an S4 with nothing more than the exhaust. You can feel the torque come onto the pipe in a similar way to 2 stroke expansion chambers.
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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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