Quote:
Originally Posted by DSX_Camaro
The resonated x pipe is for sound. It brings the exhaust note down a few octaves. If you don't run the resonated x and leave the stock H and resonators, in my opinion at least you're leaving a lot of satisfaction on the table. The resonated x definitely seems to be the ultimate addition to our cars for sound. You don't need it for power, necessarily, on paper and in theory x pipes flow best, but for sound, absolutely. Adding the resonated x to my NPP system was the best decision I made.
You'll see some minor gains running shorty headers, but yeah, at least deleting the secondary cats (unmonitored, no CEL if you do) is where the gains are. High flows or long tubes with / without cats is where max power is. And then tune.
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Those of us who have LT headers, need the resonated X pipe to eliminate the RASP that is horrible in the 2200 - 2800 RPM range.