I'm going to be upgrading my exhaust soon, here is my plan:

Replace the Y-Pipe with one from Magnaflow
Delete the muffler & resonator
Add Magnaflow SI-DO with a side exit behind passenger tire

I'm going to order the y-pipe and muffler online to get a better deal and to avoid taxes, then have the shop put everything together. I would like to know what size Y-pipe I need. I'd rather not crawl under the truck to find out. It's mainly the inlet that I'm concerned about, I'll probably end up changing the pipe after the Y.

Thanks!

 

the 07 should be a 2.25 pipe off the manifold, might want to pick up some tight mandral bends too, otherwise most exhaust will hack some cruch bent pipes in there

 

here are the pics of my y-pipe install, (its an 08 with 2.50'' pipe) and the goober at the exhaust shop did some terriable welding

IMAG0133.jpg

IMAG0132.jpg

 

Yea, that welding aint pretty, haha! Anyway, I appreciate the info, 2.25 is what I was thinking it was. I forgot that I took this pic a while back and I'm hoping to install the new Y-Pipe where the red line is. It doesnt look like it will require much fab work to get a good fit... at least I hope not..

IMG_1279.jpg

 

wow! i knew they were different, but not that they were that different, here is a pic of mine and the obvious restriction






IMAG0135.jpg

 

2.25 is correct..I ordered one but my exhaust shop said that it would be nearly impossible to install it properly. possibly why the welds in that pic look scary? wish I could do this mod..