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      01-23-2010, 07:01 PM   #37

Drives: 2013 Estoril 328i M Sport
Join Date: Oct 2007
Location: Beverly Hills, CA

Posts: 2,938
iTrader: (6)

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2014 BMW 428i  [3.88]
I had a no cat straight pipe setup on my car for five days before I got hi-flow cats, and I got a headache every time I got in my car from the horrible exhaust fumes. The cats helped immensely but kept the sound the same, which is what I was after.