i agree...i think the difference is minimal....mt truck runs and sounds excellent with the pipe i have and the factory pipe is already mendrel bent so there are no harsh curves or anything reallyI've been wondering the same. I just had the muffler shop cut my cat and muffler off of my stock 3.5" exhaust and weld a piece of pipe in its place. Is there enough EGT drop difference and any performance or sound gains to be had by putting a 4" system (straight) on in place of the 3.5" straight piped system ??
I could be wrong, being that I don't have much experience with this, but I just can't see there being much difference in a 1/2" of pipe. I could see maybe a little difference in the bending of the pipe (the 4" aftermarket system being smoother and less kinked)......but my stock system doesn't look all that bad to me. Again.....correct me if I'm wrong please because I am very curious myself.
With that being said.....I would love to have a 4" system on my truck based upon the reviews and gains everyone seems to see over stock..... But I can't afford it at the moment......therefore the straight piped 3.5" system for $60.
yea but you gotta remember when they say stock they mean still has the CAT and MUFFLER on it....remove these 2 power robbers and i believe your exhaust will be almost as efficient as a 4in kit.Don't know if it's true or not but I've been told a larger system will drop a little low end power but gain more on the top end. There was an article in Diesel Power that showed dyno runs for a stock system and a 4" system and the 4" has less power up to 2200 RPM then shot ahead of the stock system.
That being said, I will still put a 4" system on sometime down the road!
yes I think it is worth it but im biased I have the 4" system