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Message: [QUOTE="mikem, post: 1178512, member: 20037"] I am considering 3.5" vs 4" downpipe... i currently have a walker BTM in 3.5" sitting in its box. my current truck is almost all stock and was considering keeping it that way, but I have lots of parts laying around and have decided to get a few more and have a little fun what I've got: stage 1 casserly injectors, TW 6 pos, 6637, beans sump, 205 tstat, gauges, racor pre-pump, buying an FRX what I'm wondering is if there's any advantage to going 4" with the stock turbo? I got a brand new garret gtp38 a couple months ago when u was planning to just keep the truck all original (kicking myself now). will a 4" downpipe give me any advantages over a 3.5" DP on 3.5" pipes and stock turbo in terms of EGT or spool, or just one less thing to buy if i upgrade turbo and exhaust? is there any reason to go with a 4" full system with what I have, other than noise and fancy looks? my stock pipes are in good shape, and would add the aforementioned BTM muffler. could care less about its appearance, if i went 4" would run no tip [/QUOTE]

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