Should I go with 4" or 5" exhaust?

[mdrnizd]

What brand exhaust would you go with and would I notice a difference in mileage between the 4" and 5"?

Who has pictures of theres installed?

[ynots57]

between a 4" and 5" exhaust your not going to see any difference in mpg. The factory
4" exhaust is a good breathing system once you drop the cat and/or replace the origional restrictive muffler with a free flowing design.

[jmorris89]

I cut my cat off and put a magnaflow muffler with a chrome tip that I bought from a local exhaust shop. Made the ole stock stuff look and sound pretty good. I have not really seen any differance in MPG but it sounds bad .

[fordkiller43]

got my 4 inch straight pipe thats nice and loud!!

[mdrnizd]

I am hoping it will increase mileage as that is my goal. I am not to worried about it be stock, I just want better mileage.

[mdrnizd]

What does a 5" turbo back MBRP cost?

[ynots57]

The turbo will spool more efficiently when your exhaust is relieved of the back pressure caused from the restrictive stock muffler. If your able to keep your foot out of it once you’ve got it sounding nice you will probably see a gain in mpg.

[nike]

Go 5. I went 4 and now I find myself wanting a 5. Go 5 and dont look back.

[Steveo24]

:thumbsup

[louielouie]

In the latest issue of Diesel Tech they installed a BullyDog 5" cat-back and netted about +6 hp plus sound. This was their test-bed that already had an intake & 40hp DDP injectors.

[avshi750]

check what you're getting. some 5" kits are 4" to the muffler and 5" out the muffler. i bought a Grand Rock 5" turbo back system just for that reason. i figured it might be a nice sound compromise with better flow than a standard 4" system.

[Steveo24]

I bought one from JEGS, their kit was very resonable in price, and was an easy install as well.