Anyone have the short Donaldson muffler on a stock 03 exhaust system? I want something to help the flow and a little performance but I don't see the need to change everything...So I was going to change the muffler and put on a 41"(?) Donaldson... I see a lot of people put the 51" on but that is with 5" usually. I haven't seen anything about people using the shorter one on a stock 4" pipe. Are they louder? Do they drone? Do they improve flow? Do they help the turbo sing?

Thanks

 

I have the 40" nelson on mine. I have the stock down pipe, then installed 4" to the muffler, then the stock 4" tail pipe. It is a louder, throatier sound. I don`t think I have much of a drone, only noticeble when pulling hard. I think it helps with the exhaust temps. Don`t think the turbo sounds much different.Am happy with how it all turned out.

 

Installed 4" to the muffler? I thought it was already 4" all the way? Maybe I need to measure more than just the tailpipe...

 

No......3.5" on an 03.

 

That blows

 

Yeh, 3.5 from turbo to muffler then just out of muffler expands to 4". From the first joint after turbo , I installed a 3.5 to 4" adapter and went from there.

 

So if I wanted to change my down pipe to muffler what do I do? Does anyone have just that section of pipe or do I need to get an entire kit (mbrp or magnaflow or whatever) that comes with a tailpipe I don't need and a muffler I don't want?

 

I think you are 3.5 " all the way......I'd measure to make sure.

 

I have the Donaldson 40", it has less attenuation than the 51". I had a little drone above 2500 when towing. I added a mega-cab resonator and all is well now.

 

03 and 04 are 3 1/2 to the muffler and 4" out at least mine is.
Jim O

 

Same as mine.......I thought 03's were full 3.5 " guess I thought wrong.

 

So who makes a turbo to muffler 4" pipe for me so I can put in a 4"-4" muffler?...Without having to buy a kit?