I'm wanting to do both the racingline ypipe and a muffler setup. I wanna get flomaster original 40's and have 3in tips welded on the muffler. Basically what I'm asking is which one of these would be better to do first and does that setup sound like a good setup.

 

I went with y pipe first and the sound did not change. I also didn't really notice anything from the butt dyno. Will be going the custom route with my exhaust and will eventually be selling my Racingline YPipe for $220+shipping. (Put it on in December).

Go with the exhaust first just because the OEM exhaust is more restrictive than the 3rd cat which really acts like a hi-flo cat.

If interested in my YPipe lmk but I live in CT and since this is T409 SS instead of T304, it has already slightly discolored from both the salt and high heat. Has a Bronzish tint but everything else is still structurally sound.

 

Th y-pipe will add power, the mufflers add sound. Which is more important to you?