http://www.summitracing.com/parts/mpe-10778/overview/

here is the magnaflow y pipe. There is a list of muffler flow rates over in the FAQ, if you are basically stock, no more than 600 CFM is recommended.

Here is a magnaflow that is rated pretty well for CFM.
http://www.summitracing.com/parts/mpe-12388

Here is the FAQ with more CFM listed.
https://dodgeforum.com/forum/3rd-gen...mparisons.html

 

now if i buy the y pipe is it easy bolt up or does it need to be cut and welded...sorry im novice to this....... i was also looking for single exhaust not dual

 

if im running a 93 octane tune with a diablo tuner and a kn intake is that still stock or could i go high cfm

 

The magnaflow Y pipe is a weld in piece. The factory Y pipe will have to be cut out and the new one welded in. Best done by a muffler shop. There really is nothing easy when dealing with exhaust systems, even brand new ones are a pita to get apart, unless you have a rack and can work standing up under the vehicle, and even then sometimes they're still a pita. If you're looking for single exhaust you will need a 3 inch inlet 2.5 inch outlet muffler, which can be found just about anywhere mufflers are sold. If you don't know what size muffler to get, have a muffler shop tell you what you need and then let them install it, and you will be way ahead of trying to do it yourself, since as you say....you are a novice. Your truck just needs a regular muffler....400-500 cfm will work fine...nothing fancy or high flow

 

This set up cost me $300, NO Y pipe, custom bent tailpipe that comes out before the rear tire and sounds sick to boot. That Magnflow you were looking at at Summit seemed a little pricey.