stock Y pipe?
The stock piece is a choke point in the exhaust.
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Plenty of other free mods you can do if you've just got the itch, I know how it feels. I too once cut off my EGR tube.
random technology makes a great fitting hi flow cats and y system that is 100% direct bolt-on. it took me 30 min. to replace that on my sisters ws6 on a lift.


Most gains are going to be less than that, as nearly all catbacks are better. I made back to back runs with my cutout open/closed and ran identical times. This is making about 400rwhp, with an SLP Dual/Dual muffler.
Most gains are going to be less than that, as nearly all catbacks are better. I made back to back runs with my cutout open/closed and ran identical times. This is making about 400rwhp, with an SLP Dual/Dual muffler.







