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Here is my setup in my car. (it has helped mpg)
4-2-1 Header (good for low-end power)
2.5" Exhaust (good for hi-end power)
Magnaflow Hi-Flow Cat.
It ended up being a very good combo. Tool'n around town it is nice because Ill have decent power under the power curve. And if I ever need to surpass 3k, Ill have power up there too. It has been actually very friendly to my gas tank!
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