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The stock cats are before the x pipe. There's no down pipes on a NA car. Those are the cats you're seeing attached to the exhaust manifolds. The hiss is
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09-08-2013, 07:14 PM
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A True Z Fanatic
 
Join Date: Nov 2011
Location: Houston
Posts: 12,265
Drives: 2011 370ztt
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The stock cats are before the x pipe. There's no down pipes on a NA car. Those are the cats you're seeing attached to the exhaust manifolds.
The hiss is just something you have to deal with on a VQ. They all do that.
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