i'm about to order my mufflers, do i need offset inlet and outlet or or just offset inlet?

 

Offset inlet, offset outlet.

Make sure you obviously match the diameter of the muffler inlet/outlet to the diameter piping you plan to use.

What muffler are you getting BTW.

 

flow super 44s, what size is the stock piping on a 99-04 v6

 

2.25"

 

so if i wanted to keep the stock manifolds with ah pipe and 2.5 piping, could i do that. i guess what i'm asking is how do i go from 2.25 manifolds to 2.5 for the rest

 

are you doing this your self ?

 

You can take it to a good muffler shop (not Midas or Meineke, something local) and they should be able to use some couplers to expand/contract the piping size. Just tell them the size of the mufflers, then tell them the size of the piping you want.

 

well what exactly would i gain from going with a 2.5 piping instead of 2.25. well i do see most the h pipes are 2.5. Are the front cats on the manifold or the y pipe?

 

You'll loose backpressure... which means you will lose low-end torque (the good feeling you get when you hit the gas from a dead stop or cruising at low RPMs). Stick with 2.25" piping.

I have longtube headers, no catalytic converters, and 2.5" piping. When I picked it up from the exhaust shop, it sounded amazing. However, when I went to get on then gas, I was disappointed with acceleration (low-end torque). I finally got a 93 octane performance custom tune with a handheld tuner and it makes the car accelerate harder than ever before. I don't think you are looking to spend $400 extra + the price of your exhaust right now so go with the 2.25" pipes. 2.25" pipes and the stock manifolds flow great for a stock/mildly modified car. I have plans for the car in a few years (m112 supercharger) that 2.5 piping is a nice bonus to have.

And all 4 cats are located on the y-pipe.

 

well what about a h pipe i'd like to get a catted one, i can't get one of those is 2.25 can i?