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My theory is, unless its a V8 or maybe a V6 bigger than 4L, you don't want to hear it, and neither do the people around you. My friends and I have toyed with the exhaust on our trucks enough to know this is true. I'd leave a stock type sysytem on it, but that's me.
I agree, I have fiddled with mine for quite awhile and right now it sounds about as good as it ever has, just loud enough to tell it is running... barely.