Matt S

I just put on a 5" stainless silverline exhaust this weekend. I added a the 4" elbow in the process. It make a big difference in sound from stock. Nice and deep. I haven't towed with it yet so I don't know about drone. I have noticed the egt's cooling down much faster than before. At least 50* at idle. I need to get a few clamps on it before I take it on the highway to get an idea of any egt differences.

If you are going to upgrade, I wouldn't keep the old exhaust elbow.

HotRodK

I need to hear someones 5" up close. Ill have to start looking for trucks on the street with a big pipe.

jwb600

http://www.youtube.com/watch?v=Eqz1lH28ugk

06 5" turbo back kit but has a different turbo so the sound is different but you get the idea

surfram

5" MBRP on 3rd Gen:

http://www.youtube.com/watch?v=YzdLwYPYSPE

5" FBD on 3rd Gen:

http://s156.photobucket.com/albums/t...t=100_2728.flv

5" MBRP on 2nd Gen:

http://www.youtube.com/watch?v=sNcGK...e=user&search=

HotRodK

That 5" MBRP sounds great! Can you hear the turbo out the tailpipe at all?

projectfreedom

Just curious, but what 4" elbow are you guys referring to? I had not heard of that mod before.

wap

A factory elbow from an 04.5 or newer 5.9.

Billy Ram

I have run 4" after market and 5" single exhaust. I can tell you the 5" exhaust moves the drone up to a higher rpm. The 5" has a deeper tone to it and with the right muffler it can be quiet. If you're making over 600 hp you may see lower egts and a bit more low end torque with 5". Stacks seem to make the most differance.

HotRodK

The '03-'04 "305" engines have a 4" to 3.5" turbo manifold (elbow) and the '04.5 and newer "325" engines have a 4" to 4" elbow. When doing a new exhaust system, a lot of guys are going to the newer larger elbow for better EGTs and more overall flow. They are not expensive either. Mine was $96 brand new from Dodge with the clamp. You can find them used for cheaper, but you usually end up having to spend time getting it off the other truck. Time is money.

Cyclops

Just this weekend put the MBRP 5" on my stock truck. It sounds great. Not to loud at highway speed (from in the cab) but pretty rugged sounding under load. The biggest reason I went with the 5" was so I wouldnt have to change it later when the other inevitable upgrades come. As far as losing low end power its not enough to notice.

HotRodK

Hmmm, looks like Ill have to price out the 5" now too..

RowJ

I've been reading this theory for years! Sorry but don't buy it on a turbo charged engine!

I ran 4" for 4 yrs before a 5". If there is any truth to this argument.... it's inconsequencial and not worth considering on our CTD's. JMO.

RJ

jwb600

so you are saying it helped your truck out or hurt it?

HotRodK

I think it helped out on his truck.

RowJ

I was trying to say that a 5" won't hurt performance on your truck. I don't see much help either.
Maybe 50* lower EGT's when I was a single turbo and over fueled.

Only reason for a 5" exhaust, IMO, is better sounding truck.

RJ