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I have an EVO system and heard a GT4 at the track and thought it was considerably louder at start up and on track.
But I'm not looking for a race exhaust sound level. The GT4 sounded awesome to me.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires." 
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