Firehawkslp

It's important to be aware that Rotary engines exh flow is high for it, discplacement and hot upwards of 1400deg + F also loud' vary loud. A twin rotor 12a or larger 13b has the same number of firing impulses as a v12 per revolution. Every time an apex seal passes the exh port there is an exhaust pulse, each rotor has 3 sides times 2 = 6 combuston events same as a v12, 12 cylinders Devided by 2 = 6. Piston has 1 exh stroke every other revolution. It's been said that the internal combustion engine is just a bad air pump. Well the rotary's pumping effectancy is even less; so any restrictions on the intake or the exhaust can really effect the performance i.e. power of the engine. some basic inf and parts also you might want to look at rx-7/8 web sites see what mufflers their using. http://www.racingbeat.com/FRrotary.htm http://www.rotorsportsracing.com/performancetuning/exhausts.htm P.S. Sorry for the rant just my 2cents