... I can't believe I read through this entire thread and I truely believe that I have lost several brain cells in doing so. That said...
I am reminded, and so shall share with you all, that there are plenty of 4-cylinder cars which came with "ricey", as squirls so eloquently put it, dual exhaust from the factory;
Honda S2000
Toyota MR-2 (turbo and non turbo)
Dodge SRT-4
just to name a few.
To go around posting that "dual exhaust" is downright "ricey, stupid, and pointless" is a gross display of ignorance on several peoples parts. People so quickly forget such simple things like factory dual exhaust four bangers.
I'd never put dual exhaust on either of my cars, not even for a wastegate dump on my turbo car, but I'll admit I thought about making a custom set of secondaries and running dual all the way out the back from the header just the Germans do on the BMW's and Benz's do. That would be a "true" dual exhaust. But I went boost instead lol. And I'll stick with an OEM looking 2.5-3" tip hanging out the back. Stealth=clean clean=sex!
Btw, the muffler on that silver s2k is expensive as shyte!