Quick exhaust question

[Wantadieseltruck]

Straight pipe or MBRP 4" turbo back?

All I plan on doing is a CAI, gauges, and a 6pos chip.....

Do I really need a 4" catback or will a 60 buck muffler delete give me the same gains?

[Flatbedcowboy]

It would be best to get rid of the Cat and the muffler.

Personally I want to get the full 4" exhaust for sound, gettin rid of the cat and muffler, a bigger down pipe, and relocation of where the pipe exits (it touches my mudflaps) and I may have or may have not backed into a stump and bent my stock pipe..............

[Bend6.0]

If you do not do much heavy towing just straight pipe the stock system. If you do tow then consider going to the 4", mostly to reduce EGT's while towing. The larger exhaust pulls 100-200 degrees out over stock exhaust. I have run both methods many times, for the money I like the straight pipe stock system. I have never noticed power/mpg gains when switching to the 4" kit.

[Raul@Stealth Automotive]

IMO just go with a full turbo back kit... if not then dont touch the exhaust... a cat back kit is useless

[Turbostang500]

Just straight piped mine and wasnt expecting it to be as loud as it is when the back pressure valve is closed! I read on hear about it but it still kinda took me by suprise!

That said, i bought a piece of straight pipe from summit and welded it in where i cut the muffler out.
It cost 20 bucks. I used the rest i would have spent and got a 3.5-4.5 tip.

[Toms01PSD]

My truck was straight piped and it was very annoying. Bought a 4" MBRP turbo back kit and it sounds awesome from the outside and it's hardly noticeable in the cab.

[Wantadieseltruck]

Originally Posted by Toms01PSD

My truck was straight piped and it was very annoying. Bought a 4" MBRP turbo back kit and it sounds awesome from the outside and it's hardly noticeable in the cab.

Im assuming Your talking about the MBRP with the muffler.. Or did You buy the straight pipe?

[Toms01PSD]

It has a muffler on it.

[Wantadieseltruck]

Well I changed my oil Yesterday and realized that my stock exhaust didnt even have a Cat on it. Is this common for late 99?

Anyway I'll probably just delete the Muffler for now....

[ltfire344]

Yeah i have a 2002 7.3 and all they have is a muffler, no cat. I found a muffler delete pipe from puredieselpower.com. I cut out my muffler at the welds before and after the muffler. Slid the delete pipe in place clamped it down, and was good to go in about 45 minutes. Looks better than the things some of the guys do on here. I've been thinking of getting MBRPs 4inch turbo-back straight pipe system. For the sake of EGT's, and a full stainless system looks good too. Truck has a good rumble at idle. When you put your foot in it she really screams. Lets just say my passenger side rear window gets rolled down alot. Windows rolled up you cant really hear it. Maybe a mild drone. If you have the cash to drop on a full turbo-back system i would do it, but if not go with the delete pipe.