2007CalSpec

I'm thinking about buying the MAC O/R Pro Chamber. I like the fact that it's modular and youcan switch back and forth from your stock cats and the o/r pipes. The only thing that concerns me is that the picture shows only two O2 sensor bungs (one on each o/r pipe). When comparing it to thePypes o/r H-pipe, the Pypes has 3 sensor bungs (2 on one pipe & 1 on the other). Anyone know why that is? Maybe there's a year difference between 2005-2008 in the O2 sensor count? I don't know. I have a 2007 model by the way.

nitetimebolher

I didnt know you can switch back to forth from stock cats to OR?

2007CalSpec

Yeah you can switch back and forth but first you'd have to cut offyour stock H-pipesection and install the pro chamber. The pro chamber will stay in place as you swap back and forth between the o/r pipe and your stock pipes with cats.

Caution

+1 on that ... good to know though

onederful100

i believe this one you have the link to is a direct replacement for the stock Hpipe, it replaces the whole thing. no cutting required, it bolts right up. and there are 4 O2 sensors, 2 front and 2 rear, believe this is the same for 05-08.

2007CalSpec

The description says "Cut & Clamp Easy Install 3 Piece set, fits to Stock & MAC Direct Replacement Headers."

In the picture, you can see the Pro Chamber section, whichis available separately, and the two O/R pipes connected to it. Thus, 3 pieces.

You only have to do some cutting if you want to be able to swap out your stock cats for theO/R pipes. Otherwise, it's a direct bolt in if you take out your stock catswith H-pipe and replace it with theO/R Pro Chamber and don't plan to switch back to cats in the future.