can this cause power loss? it seems after this was done my car has lost its umph

 

No, cant cause a power loss, but it more than likely shifted the power and torque range.

 

just feels like off the line until about 1500 i have no power now and in 2nd gear punch it bogs all the normal stuf is new opti exetra

 

How it was explained to me is that with the cat in place, you have plenty of backpressure which helps produce low end torque. When you get rid of a cat or in your case, gut it, you lose that back pressure and the torque you are so used to having down low has moved up the rpm range just a bit. I recently removed my cat, agian, and its true, you do lose some low end torque but gain plenty of top end power from it.

 

What year?

 

94

 

When i had my off-road pipe i was picking up false knock almost 5 degrees at idle and when i put a cat, back on the car it all went away. Needless to say i picked up alot of power going back to the cat setup and the car sounded much better.