Well I can't really give an accurate opinion since my JLM o2 housing has been leaking at the flange since day one so I don't know how the car really should feel.
What I do know is that with my Stage 2 and Mopar cat-back I lost a LOT of my low end torque. The o2 was installed at the same time along with a ATP 3" dp no cat. Up top, it feels just a little better but barely.
The o2 is coming out soon and the stocker is going back in.
I do have the 3" 02 housing and it was welded onto the exhaust. But IMHO it's well worth it because it's either a 2 or 2.25in bottle neck so if you go to the 3" exhaust your not really getting the full potential of the system. Yes you will loose a little torque but not as much as putting the exhaust on.
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