That's a Post-Whore bunch of Unnecessary crap if I've ever read it.
What's that got to do w/ his question?
Dude, I don't know what "Smoke" you're talking about.
If it's Smoking, you've got internal problems.
Dual Exhaust on a 4 cylinder is for show only, and there's no way it could produce any gains w/o spending well over $1000 on Very Developed Custom 2-into-1 pairs.