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I went 3" DPs, 3" -> 2.5" tapered TP's and 2.5" Catback. Very good performance. From what Greg Dupree said, going with the 3" Catback does net you about 10-12 whp more over and above the 2.5" Catback at the 500 whp level. I already had the 2.5" catback so it wasn't worth it for me to make the full 3" switch.
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