is there such thing as to big would 5 inch straight pipe be to big? rather than 4 or would it just run cooler?

 

5 inch isnt too big... but i get by w/ my 4 inch exhaust. i think 5inch is a little overkill

 

i went with 5 straight after i rebuilt the engine, ive noticed about an average of 50 degree drop in my egts, ovcourse that could be the bigger pistons. it sounds exactly the same as my 4" i am currently running a 4" downpipe into 5" pipe to my 5" stacks

 

a 5 inch exhaust is not needed until you are in the 550-600rwhp range. Under that you are loseing power with the 5 inch system

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I'm gonna say its the pistons. I used to run a 4" into dual 5" stacks ... swiched to 4" into one 7" which acts just like an exhaust tip and gained power

 

loosing power with a 5 inch system

 

I know a couple of people with cummins and powerstrokes who have been over the 600hp and they've actually switched back to a 4 inch after having a 5 inch. They all say that they had no power with the 5 inch.

 

i havent noticed any difference between the 4" and the 5"

 

I wish I could say I had personal expeirence with this issue. I won't know for a couple more months until I get my 5" stack system

 

i was originally running straight 4" from the turbo to 5" stacks and now im 5" after the down pipe

 

i have 5" and i love it.it sounds awsome.and it may a little but i don't think it really runs much if any cooler.