Personally, I don't think anyone makes a better CAT/testpipe and down pipe than ATP! The stock turbo outlet is only 2" so does a larger o2 housing actually make a difference? I think a larger CAT and down pipe will have the greatest effect.
I tried to access your web site but it says under construction?
Also, Welcome to the Forum, I think I have read some of you posts on the SRT forum, if your the same Scott, great posts!
edit; Re- thought my opinion on exhaust size.
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