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      06-07-2018, 05:34 PM   #34
taranfx
Z4 35is
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Drives: 2011 Z4 35is || 2016 435i
Join Date: Apr 2016
Location: Santa Clara, CA

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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
There is a slight difference in smell from full catless to secondary cats still installed. When I had just catless downpipes and I still had secondary cats the smell was barely noticeable but still apparent compared to fully catted.

Fully catless to me is quite obnoxious. I've had a few cars with full catless modifications and I dont think I will ever go back to it. I dont miss pulling up to lights and catching a wiff of fumes.
Help me understand this better. With windows down at stop light and just secondary cats, how bad is the smell?
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