2006 Midnight Blue Xterra S
Join Date: Jul 2010
Location: Saint Louis
Y pipe is definitely the most restrictive part of the exhaust. Realistically replacing any part of the exhaust for "gains" isn't going to net you a as large of a number as you think unfortunately. Our motors just don't really respond that well to it.
So if you are doing it merely to get gains it wouldn't be worth what you're trading in convenience IMO. Most of the people on here go with some sort of aftermarket system after our cats bite the dust and start throwing codes. I replaced my whole exhaust system, headers back with DT Shorties, B Pipes to replace the secondaries and the Dynomax Catback system. I hate it. The dynomax system is garbage, fine for the $250.00 dollars to get you out of a pinch to pass emissions, but that's about all its worth. The Y-Pipe is junk, the steel is junk, the whole system made it 2 years and then it rusted out. High flow and a crappy muffler made it sound like a crappy car, too raspy. The B-Pipes are okay, but they throw codes all the time that need to be reset because the O2 sensors don't like them. My DT Shorties are holding up pretty well. All said and done, if it keeps throwing codes on the B pipes I am going to do another round of replacing the primaries again (65k on them), putting secondary cats back in, and taking it to a custom shop to run a true stainless 2 in 1 out exhaust with clamps in case it needs to be taken apart on the trail for any reason.
So, all that being said, spend your money elsewhere if you're looking for just gains. If you are wanting to get in front of your cats failing (mine made it to 90k), you want an aftermarket sound, go for it. But don't do it solely for gains, you'll be disappointed.
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