a pacesetter header will help free up some horsepower, a muffler won't do much if anything at all, the rest of the exhaust pipe from the catalytic converter back needs to be replaced with larger diameter pipe as well.
How much horsepower does power commander add to 2012 R1
5-10 Horsepower.
From 5 to 10 horsepower.
From 5 to 10 horsepower.
In normal everyday driving it will add no extra horsepower. In a racing situation at high rpms it will add some but not much. How much depends on the engine that it is installed on.
There are many wild and outlandish claims out there about how much horsepower can be added However independent tests seem to confim most kits will add about 20 extra horsepower.
5 to 9 horsepower about 7 horsepower i felt a big change of horsepower in mine
10hp
Depends on the cam.
no it doesn't but power flow out to waste
no *Correction - Reduced back pressure does usually result in more horsepower. Some cars run with resonators rather than mufflers which reduces the noise without as much back pressure, thereby increasing horsepower.