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How cheap do you want? I got a brand new xforce 2.25 twin exhaust off eBay for $440 and it puts out probably the best sound you can get from an alloytec, sounds really good and did actually make a noticeable performance increase
Keep it as is , a lot of V6 exhausts sound like a farting duck, I speak from experience .
I think a duck fart has a bold air of menace about it, speaks to the untapped potential of the Alloytec... cue to 0:04s:
[video=youtube_share;dvIdm28WF5U]http://youtu.be/dvIdm28WF5U[/video]