Completely disagree with this comment. Fi sounds like nothing else on the market. I have the system but with high flow
Downpipe’s. I had a different system on the car and didn’t think it would change the tone that much. I was wrong. Stock cats wil tone the system down but you will hear an unique tone difference. One of the major reasons is that the Fi uses a x-pipe which the s63tu engine really needed. The m5 had one stock
Happy with everything about the system but don’t like their valve system
Not using oem
Valves
Quote:
Originally Posted by ericliuhc
FI without downpipe sounds close to stock too .
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