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DMan1198 wrote:I suspect the reason your friend lost power switching exhausts had nothing to do the the diameter of the pipe. My 12 ram has full 5" turbo back and with the tuning I'm running it goes like hell. I am definitely WAY overfuelled with the stock turbo. I'm going to be switching to full 5" on my 93 because that's what the back of my s400 has and I like not bottle necking things like that. The Roo Hunter is getting a big bump in fuelling though so it'll be into big numbers by the time I'm "done"
RCCUMMINS89 wrote:When I put on dual 5" exhaust from the case back... I NOTICEABLY lost low end power. This was on a close to stock 1st gen truck. WOT didn't change, but it cut the legs off of it down low.
cmann250 wrote:I don't see how you could go wrong with a full 4" system. A VE 5.9L Cummins doesn't spin the RPMs or have the displacement to "need" 5" exhaust.
I also recall that TWorline has 5" exhaust from the transfer case back on his truck. I don't think the 5" would fit past the transfer case for some reason.
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