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Hi All, I've done some quick searches but wasn't really able to get any definitive answers for what I was looking for, maybe I wasn't looking hard enough Anyway, a friend of mine is looking to replace some leaky mild steel dump pipes he has on his skyline. They are custom 3" mild steel dumps. These go into 3" front pipes that run into a twin 3" cat back to just before the diff where it merges into a single 4". I believe the front pipes and cat back are CES items. He is on a bit of a tight budget at the moment for various reasons and can't afford to go CES competition dumps and front pipe combo ( almost $1700 in mild steel!!!) which was my suggestion. Are there any off the shelf 3" items available that anyone knows of, or does he even need 3" dumps. I was under the impression that the size at dumps and front pipes is most crucial in limiting restriction in turbine flow. (As well as placing turbulence at least 400mm away from turbine outlet. The basic specs of the motor are as follows: 2.8L stroker kit HKS GT-RS twin turbo kit Stock mild steel exhaust manifolds Oversize valves (inlet and exhaust) Tomei cams (268deg in/ex I think with the largest lift) The engine is making 550rwhp at present Custom 3" dump pipes (leaky as the mild steel is corroded under heat wrap) CES 3" twin front pipes CES dual 3" exhaust merging to single 4" at rear. Response is more important to him than outright power (if that has any bearing in suggestions). Thanks in advance for any guidance! Cheers Jamie
