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I am running 2.25" Megan DP & TP. This exhaust also has 2.25" inlets that merge into 3.15" single piping. Exhaust velocity will slow as it cools, when the diameter increases (I.E. 2.25 DP/TP to 2.5 Cat-Back) on exhaust, turbulence occurs and the exhaust flow slows down further. Area of (2) 2.25" = 7.94" and Area of (1) 3.15"=7.74". This means, that as the exhaust cools, the area becomes *slightly* smaller, so exhaust velocity remains the same. While these losses and gains are probably negligable, I made sure I wasn't hurting performance. I am also sure you are referrring to the 2.25" part that makes it NA, but do you see the logic behind that, it is matched to my DP/TP combo that people do say, while not as good as the SpecialtyZ product,is good for the money paid.
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