exhaust backpressure??
 

so im still trying to figure out which exhaust to get and i got it narrowed dont to a 4 inch of one brand and a 5 inch of another brand. ive been hearing that i wont have enough backpressure with the 5 inch does anyone know if that is true?

You don't need back pressure, so take your choice 4" or 5".

in truth your truck isnt pushin so much fuel and air to make enough exhaust that a 5" would help you out. now if ur gunna build the truck up a lot then a 5" would help later on but the help it gives you later on would be so little that i dont really think it would matter. now im not an expert so dont just take my word for this, wait till someone smarter than me comes on and says im right or im wrong

I agree with riddick about it not really helping you any, but from what I know and have read on here a 5" will give you a deeper rumble than a 4". Not so much louder just a deeper tone.

you dont need back pressure, if that was the case no one would be pulling muff and cats off, everyone says run 4 inch with no muff or cat to get better air flow

you will gain about 50 degree cooler on your egt's the flange that comes off your turbo is a 4 inch

im pretty sure the stock turbo has a small back pressure plate built in and even so not needed with the turbocharged engine itll be fine so yea ur choice between 4 or 5 my suggestion 5if ur planning on intake and chipping it just personal preferance to keeping egt's down

The exhaust flange on the turbo is 3.25"... Not even close to 4"...

The turbo creates all the back pressure you need. NO need to worry or even think about that, at 25psi boost you have about 45-50psi of back pressure between the exhaust manifolds and the turbo...

The back pressure valve is not to control back pressure like that, it is used to help put a load on the motor when cold and raise EGT's, oil and water temps...


There is no "point" where a 5" exhaust will gain you more HP... 4" turbo back is all you need, anything else is for show, or sound.

go for a 4in, my new rig has a 3.5 banks and with a muffler and sounds just as good as my 4" straight

i just heard that the 5s have a deeper rumble and sweet tone to them.. ive never actually heard one but ive heard 4s and they sound good.. is that true?

exhaust
 

in my opinion i have owned a 4" and my brother who had 5", there is very little difference if you dont have the power to push out a 5. both are good choice and will accomplish the same thing but the 4in should be easier on the wallet

true true.. i just only wanna have to buy one once haha

There is NO point... I repeat... NO point where a 5 inch exhaust is "nessasary" or builds more power.

End of story.

ive got a 4in down pipe an 4 in mbrp, truck runs just fine with chip an intake an all that stuff. 4 in is all u need, especailly if your not planning on building ur truck to the max. if u want a deeper sound 4in down an 5 in back, but thats all its going to give u is sound. 5 may give u a little longer of a turpo spool time without the fuel an air upgrades, from what ive been told, but to answer ur question back pressure is not an issue. either or is fine just go what you like

everybody i talk to says a five is pointless, the 4 is just as good and cheaper, all the diesel shops round here recommend 4, anything bigger is a waste of money they say, you get very little sound difference for the price

I'm running 4" MBRP (duals...I like things to look balanced so I wanted two exits lol) and it is plenty. A guy I know (Brian Jelich, check it out on YouTube) is pushing 992 HP in his Stroker and he was only running a 4" with a single 6" stack (before the hood stack was installed). So as CSIPSD stated, 4" is good enough.:tu:

GO 5 inch!!:c: