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Are you sure your new exhaust has cats and not resonators? The cats bolt up to the header. If your exhaust doesn't bolt directly to the header, you're bolting it
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09-08-2013, 07:29 PM
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#17 (permalink) |
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A True Z Fanatic
 
Join Date: Nov 2011
Location: Houston
Posts: 12,265
Drives: 2011 370ztt
Rep Power: 29540   |
ARK DT-S bt.
Are you sure your new exhaust has cats and not resonators? The cats bolt up to the header. If your exhaust doesn't bolt directly to the header, you're bolting it to the stock cats. It's called a cat back because its everything from the cat back, ie the cat is not a part of it. Put up a pic of the cats on the new exhaust if its unclear. I'm sure we can figure it out.
The hiss comes from the motor. You only hear it with HFCs and TPs because the stock cats block the noise.
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