Silencers are designed by the manufacturers to meet the legal noise requirements as well as the engine exhaust needs. If you installed a range of exhausts on a test bike and were able to check the efficiency of the motor, perhaps with a rolling road, there would be differences. Are these differences significant? I suspect not. On my T100 I had a range of pipes on her, during the 5 years ownership. None of them crippled the engine, the major differences were exhaust noise, not performance.
Hi Chiari, Sounds like a great place for your raw materials, alloys, stainless, titanium, you should have the best finished bike on the forum.
Hi chiari, Yes pipes are designed for specific bikes. The Muffler is designed to complement the inlet ( be it carburetors or injectors ) which are mated together via the camshafts/valve timing ! Fitting similar mufflers, having same diameter in and out will have little effect. If you significantly open up the exhaust side you need to complement it by opening up the inlets, to rebalance the motors induction and exhaust. A motor that breathes better produces more horse power and torque. My 2008 America has had major work both inlet and exhaust, tuned on a dyno it was 51.3 HP @ rear wheel, now in the vicinity of 75/80 HP with big bore kit 904cc and head has been ported still on std cams, as I wanted more torque/mid range and after market cams usually only offer top end performance boost !! I have gutted out All the emissions controls, no SAI,no baffle in air box, top and bottom of air box opened out, no oxygen sensors in header pipes and very short wide open mufflers. So both sides of the cylinder head are as free flowing as possible, Engine can really breathe.
