Ok, I just finished installing new Borla headers and exhaust on my 05' TJ. It is REALLY lacking in any performance gains and the muffler is barely louder than stock. What is going on?

Before this Jeep I had a 97' TJ with Borla headers and exhaust and there was a considerable gain in throttle response and HP. Also, the sound on my 97' was that deep throaty rumble you get from good exhaust.

What is going on?! Could the newer catylytic converter be more restrictive? I would like to straight pipe it but it has those pesky O2 sensors all over the place.

Please help, I emailed Borla and they gave me the typical corporate BS response and didn't answer one of my questions.

Thanks,
Nick