My IM has a CB performance engine built in 2004. 1776 that I punched up to 1835 with a larger P&C set. I also took the dual 40 idfs and added the cb venturi kit that smooths out the venturi to give it a bit more air flow and hp. I have been playing with the velocity stacks and took them to 3" where the engine did not like it. Then down to 2.5" and all is good. Great sound a tad more torque...
I say all this because I have done nothing to the exhaust. It has a "stock" Porsche 356 Dansk replacement muffler.
I feel like this exhaust is constricting the potential. It may have done fine at 1776, but now with the carb upgrade and the larger cylinders..., I don't know for sure.
Any info on exhaust size vs engine size?
Is there a specific size for specific engine or ...?
I see CB now offers a sidewinder with dual tips. (I want to keep the traditional appearance as possible), but the sidewinder is a costly experiment.