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[Kappster]

I appreciate you folks that have replied to my original post. I can especially appreciate the money that has been spent to achieve a more entertaining sound. As I said in my first post, you can change the tone and volume of the inline 4. But it is the cadence of the engine that gives the basic sound. The inline 4 has a even spaced firing pattern. Like a 2 cylinder Honda trying to sound like a Harley, It cant. Because the Harley does not have an even spaced crank, it has a great uneven cadence that creates the sound. For years these Jap bikes that were made to look like V-twins but sounding like the parallel twin (the look without the cool..sound) The cranks in the Honda's were even spaced. So even with straight pipes they still sounded like a 1960s Honda twin that some kid took the mufflers off, yuck.
Likewise the Europe V-8 exotic cars have a crank that essentially just ties two inline 4s together. The American V-8 has a completely differently spaced crank. A sound (cadence)that sounds fantastic when the exhaust is opened up....(440 mopar with glasspacks).
My whole point is that when primary tubes are set up with a certain amount of differences in lengths with the correct 2 cylinders tied together that the exhaust then becomes more like the uneven cadence of a Harley or an American V-8. Then you can choose the volume and tone of a cool sounding ,lope, burble, rumble or cadence. Or what ever you want to call it. I am just pointing this out because of the WRX exhaust manifold and the much different sound that it produces.