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Old 08-19-2009, 03:37 PM   #17 (permalink)
drisko
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Join Date: Jan 2009
Location: So Cal
Age: 43
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Drives: 09 370Z PW Tour S 6M
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Quote:
Originally Posted by tampatip View Post
How much does the Stock Cats restrict the HP and Torque, say compared to HFC's? I would prefer a little bit more exotic sound than stock, but not riced out or too much drone in the cabin.
I believe the stock cats are quite restrictive. With the Fast Intentions CBE, adding the high flow cats only get you about 4whp more at the top end, but down low they give you a ton of torque gains. Also, with an intake or a tune, the HF cats will probably also yield a lot more gains.

The nice thing about the F.I. high-flow cats is they have a u-bend style non-fouler, and I have not had any check engine lights in over 200 miles of driving. Also, my highly subjective smog test (a.k.a. my nose) says that the cats are doing as good of a job as the stock ones in terms of emissions. I detect no smells or smoke at all coming from the vehicle.

Also, as far as droning, it is really not that bad. I think it just took me a little bit to get used to the sound of a more aggressive exhaust system.

Last edited by drisko; 08-19-2009 at 03:41 PM.
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