If you are going above stage 1 numbers you will need at the least a 2 1/2" flow through exhaust. A 3" exhaust is not needed unless you go big turbo or are going big turbo in the future. A 3" downpipe is good along with a high flow cat. I even went further and got a 3" o2 housing.
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\'05 Stone White SRT4
\'04 Graphite PT Automatic
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