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im sure youve heard the whole deal about black smoke being bad, so Ill skip that. I turned mine up about 1.5 flats, and get a little black smoke when I get heavy in the throttle, or if I lug the engine a little. I suggest putting in a pyro before playing with the fuel. Pistons start melting at 1250*f.
mine blows alot of white smoke on start up and when i mash the throttle, whats a pyro im not to good on diesel lingo mainly gassers lol and another thing none of my gages work except my heat and speedo whats mostlikly the cause?
id go to an exhaust shop and tell them what you want. Or you can do my method, and grind and cut and hammer and cuss until the pipe fits halfway decent lol. 2.25 to 4 inch was hard to do that way, I wouldnt attempt it with 5 inch.