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I've had both 2.5 and 3" DP's. Initially I had Raceland DP's (2.5) and the sound was raspy but performance was there and it was very spot on. The car felt very lively and breathed easier on the exhaust side.
After getting a helluva deal on a set of AR Design DP's (Both the Racelands and AR's were catless) I swapped out the Racelands and in went the AR's. Initially, a very deeper tone settled in and the turbos felt more open with the diameter change. Spool up was slightly quicker with the AR's and felt I could push the car more before or at redline.
Either way you go I really don't think you will have any issue. It also depends what you are looking to gain or what is your main HP goal. If you are looking at anything over 400BHP, I would go for the 3". Anything below that, you will be fine with the 2.5's
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Quote from Ezeedee regarding car mods:
"you're only done when you sell the car  " |