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I installed a isr o2 housing, downpipe,test pipe and street exhaust. The rasp got too bad to the point where i reinstalled my secondary cat to try to reduce the rasp but it seems to be coming from the o2 housing, would getting a different brand of o2 housing help or adding a resonator in place of the test pipe?
 

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the down pipe is causing the rasp. I don’t understand why ppl spend ridiculous amounts of money on “performance exhaust” systems when custom will do the same thing + save you a bunch of money
 

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Unfortunately getting a different o2 housing won't help, the rasp is something all the 13+ 2.0ts gotta live with. The issue is the electronicly actuated wastegate. There's no real fix unfortunately. Resonators would help, but if you're not running a tune I would suggest keeping the stock o2 housing on
 

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Unfortunately getting a different o2 housing won't help, the rasp is something all the 13+ 2.0ts gotta live with. The issue is the electronicly actuated wastegate. There's no real fix unfortunately. Resonators would help, but if you're not running a tune I would suggest keeping the stock o2 housing on
Three words: custom h pipe
 
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