What are you trying to gain by upgrading the exhaust? If its HP you might gain 2 or 3 HP which you won't likely notice anyway if your looking for that vroooom motor sound, you better find out what your state laws allow as to noise limits. Your cash will be better spent on clutching, shocks etc
I think many of us would like a little performance sound from the exhaust but with laws cracking down on aftermarket exhaust, I would say stick with stock. Also in most cases the stock exhaust produces the most power especially since the sdi is so finicky.
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