4 or 5 inch?

[MCFR22]

Looking to install a MBRP exhaust and dont know if I should go with the 4 or 5 inch. Also not sure if i should delete the muffler. Any ideas?

[The_Duke]

I put 4 inch turbo back mrbp on mine with no cat or muffler and it sounds awesome. Not sure what engine you have mines a 6.0 If its stock then 4 inch is fine. but either way delete the muffler.

[Lubbockguy1979]

5" for noise. 4" is more than sufficent. If your going to delete the cat and muffler there is no reason to go to a 4" the stock pipe is plenty. 3.5 stock w/o a muff or a kitty is better on the budget.

[smokersteve]

go with 4. If you want the noise go 5, but it would be better to get the 4", You will not lose as much low end and the egt difference is minuscule.

[Jarrod B]

How about 12"

[Raul@Stealth Automotive]

i would go with a 4" straight piped version.... if you interested in prices let me now...

-Raul

[swamp_ratt]

i recommend 5 inch. sounds a lot nicer IMHO

[Damaged82]

5inch straight pipe

[Snow4664]

i got the 5" 6224al for 440is shipped from thoruoghbreddiesel or however its spelled. comes with the muffler but runs no cat. i didnt want it to loud but it still sounds mean i like it!!!

[BFRT_King Ranch]

Originally Posted by MCFR22

Looking to install a MBRP exhaust and dont know if I should go with the 4 or 5 inch. Also not sure if i should delete the muffler. Any ideas?

Delete the muffler and lose the cat if you can where you are... You will love it! Sounds great! I have 4" and am more than impressed.