Suggestion for replacing stock exhaust with 4"

[Cummins12V98]

My Son put the Donaldson on his 15 I bought for him for Christmas. It did reduce the in cab noise buy a lot. Has not towed with it yet. But on cold start the turbo whistle is much louder than with the MBRP he had on it. He said he is going to stick the MBRP back on upstream of the Donaldson. He is convinced the noise will be greatly reduced. thoughts???

 

[NIsaacs]

Looks pretty similar. Good find.

You sure you ain't pulling my leg? That this sucker is for a log truck

Three hours later it fits and I already like it. Just to prove it went on my truck and not a Petebilt, here is a picture and some accessories for the install. Can you say it sounds like a 4th gen Thanks for the suggestion, John!

 

[AH64ID]

Haha!!

Looks good on there, but yes they are HUGE under these trucks.