Anyone's 3.0 run better with cat?

[Baby]

Could be the warm weather or my imagination, but since I removed the mk bypass and installed the cat in preparation for smog this week, the motor seems livelier. Could it be true?

[faverymi]

Flow restriction could give you more torque at the low end on the butt-dyno?

Just a guess...

[Baby]

Certainly feels like it has more pickup at the bottom but doesn't kick in at 4k or so as usual. Btw, 964 cams; otherwise, stock. Didn't think it would make much difference but for weight.

[stlrj]

Originally Posted by faverymi

Flow restriction could give you more torque at the low end on the butt-dyno?

Just a guess...

Then again, that massive 3.0 cat may not be as restrictive as the smaller MK bypass after all.