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?