well ive only heard 1 IRL with aftermarket. but several G cars. and the only ones that HISS are the ones that say they have test pipes or HFC's installed. why is that? I dont understand whats making the noise. Ah so he was refering to the stock cats that come on the DTS? or the nissans stock exhaust? because the system comes with the entire exhaust from cats to tips and everything in between. So im just confused is all. why would you run the cats off the old stock exhaust on your new DTS?
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