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      12-07-2012, 09:23 AM   #36
jsedlak's Avatar

Drives: F30 335i 6spd
Join Date: Sep 2012
Location: Morristown, NJ

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Originally Posted by RollingHard28 View Post
Just to see if I am on the same page, the catless down pipe (smaller looking downpipe) would be louder but less expensive; while the HFC down pipe (bigger looking DP) which is more money, will be less loud and more likely to pass a SMOG, is this correct?

I guess because it would be not as loud and more likely to pass SMOG, I think I am leaning to the HFC...
Yeah, it's less expensive, smaller and has more performance because there is nothing in it. The other one they have to add stuff to try and meet the emission standards and that costs time/money.

Unless it's a track car or your car is somehow 8+ (or whatever it is) years old, then just get the HFC.
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