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Message: [QUOTE="TARM, post: 1426404, member: 578"] 5in only if you do not mind the noise. It never hurts to reduce back-pressure. It may not help much but it never hurts post turbo. Ideally the down pipe entrance should be trumpet shaped for a nice smooth transition. As this a 4" transition to a 5" down-pipe with the transition completed before the downturn. I got seriously schooled by some top pro techs one time when I got to go into the pits a national meet. But for under 600HP I would not worry about it. Still if you are going to do it and really are looking to get the most out of it why not do it right? Again if the sound and harmonics of the 5" are not a concern to your driving. That very well may take a body lift to do though to get the pipe to fit by the firewall. [/QUOTE]

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