I am going to order some Flowmaster Delta Force mufflers to install on my off-road pipe (where the cats would usually be) to cut down on some of the noise with the Loudmouth and make it more streetable.

So I need to know the inside diameter or outside diameter of the MAC ORY (used with MAC headers).

Thanks!

 

Not sure exactly but its not 3". Either that or my Borla is bigger than 3". The fit where the Mac oryp and the Borla cat back meet is loose. One of these days I'm going to get off my lazy @ss and take the y-pipe to a muffler shop and get it expanded slightly. Leaks some when cold, less after hot. Prolly ought to just do the collector mod. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Bruce

 

get 2.5" in/out mufflers for the legs of the y-pipe...thats what I had in my old mac system <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Thanks! Found it on Angie's site...2.5" on both sides, so I got the 2.5" FMs like you said. Nice living in Ohio and having Jegs an hour away <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Todd

 

how well will the fm's fit? I'm only familiar with the dynomax bullet (4" round) mufflers