CAT 3126E aero 4040xl or 5050xl ???

[pyroman175]

Hey guys i'm getting ready to replace stock muffler with the aero muffler. My question is I have 4" exhaust coming from the turbo. I have a Cat 3126E 330HP and i notice alot of guys using the 5050xl, but these are usually on the C7 and up motors. Is it worth it for me to upgrade to the 5" or stay with the 4" 4040xl. I am also going to add the MP-8 chip, any comments would be appreciated. I know the faster i get the exhaust out the better, just not sure if the 5050 is overkill for my motor... thanks guys

[OneRVer]

What is the port size of your Exhaust brake?

[sandcar361]

On my c-7 the size is 4" out of the turbo then it bumps up to 5" down to the muffler so I just went with the 5050xl so it would match up.

[pyroman175]

mine is 4" to the muffler, 4" out to the exhaust tip, so i'm assuming the 4040xl is going to be fine

[1ciderdog]

Mine is the same as Sandcar - 4" out of turbo expands to 5" at the muffler.
Bob

[pyroman175]

cider dog mine comes out of the muffler at 5" also, but reduces back down to 4" again out to the tailpipe. did yours stay 5" all the way back from the muffler???

[1ciderdog]

Pete,
Yes 5" from all the way back. It comes down from the turbo at 4" but into the muffler with a increase in size to 5".
Bob

[pyroman175]

well it looks like i'm going to have to buy some 5" tubing and do it the right way !!!!! breathe breathe breathe LOL

[1ciderdog]

Pete
If you have the time - I presume you are doing this yourself - I'd suggest you remove the old muffler, lay it out, then lay out the new muffler next to the old one and old tail pipe then you can measure out what exactly you need and order it online. That's what I did but did not need additional tail pipe but did need new univerasal holders for the muffler and a couple of new clamps. You could modify the existing holders but I was lazy.
Bob

[pyroman175]

yes i think that is my plan, i believe i know what i need. It is just going to cost me a little more for the 5" chrome tip :-0 I am getting ready to leave for the weekend to the mountains and cool off.... it's 114 degrees today and i'm sick of it already. It will give me a basis of how thgis baby runs before the mp-8 and exhaust install..

[OneRVer]

Come on up to the Pacific Northwest. I think we have been in the 70's for 5 days this year. Still getting in the high 30's and low 40's at night. The high for the week had been 59. So come on up and cool off.

[pyroman175]

thanks onerver, but brrrr lol. 30's is a little chilly from 114...lol i will take flagstaff area or williams for around 50 at night and highs of 80 :-).... thanks for the invite though.... i was born in Canada so i know all to well about the cold.....

[rver98]

Here is a link where you can buy your needed material.

Exhaust Elbows

Good luck

[pyroman175]

thanks rver98, i just spent $300 getting all the material to run 5" all the way out..... dam this is getting to be an expensive hobby... LOL
I am going to hopefully take pics and document the install to hopefully help others in the future.