4'' exhaust

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12-18-2011, 05:26 PM

#16

SIXSLUG

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Quote:

Originally Posted by dodgeguy71

My truck weighs 11,000lbs, has a stock 3" exhaust that duals out about midway of the bed. I have a quadzilla on there as well. I pull a 16' trailer with all sorts of loads and egt's are not bad at all. As long as I'm not trying to pull a hill like I'm in a Bugatti. I can pull a hill quick and keep the temps below 1200 without a problem. I've looked at 4" and 5" duals but for me, spending the money to fix something that ain't broke just don't work.

Your temps are within reason because you have eliminated the constriction up over the rear axle and shortened and split the system. Sounds like you probably have removed the resonator also.

In reality the exit hole of the turbo is only around 2.5" in diameter so from a real world perspective you only need a 2.5 inch exhaust of proper length, without any backpressure to be alright. You can't get 4" of exhaust out of a 2.5 inch hole any faster. Its a question of length of pipe to free air and constriction.

Plus, a 4" tip looks cooler than a 3" hands down!