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Old 02-02-2013, 06:37 AM   #15
Focus Enthusiast
Join Date: Jan 2012
Fan#: 93397
Location: Surprise, AZ
What I Drive: 2007 Focus SE 4dr Dark Shadow Gray

Posts: 103
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I am running 2.5" mandrel bend straight pipe from flex pipe back and I don't notice any negative effect as in on the motor. I have a 4" angle cut chrome tip with it also. It is very loud and sounds mean as hell when you are full throttle but when you just rev it up a few rpms you do tend to get a lot of popping. My car is running rich so it gets more of that pop noise when you just rev it up and let it go back to idle. Interior noise drastically increases because of it. I have this setup on my 07 sedan.
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