Before you begin installing them make sure the car hasn't been driven for awhile, therefore, the motor will be cold. Also you can try to freeze (you can buy a spray for that purpose) the bolts that connect the cats with the headers since i doubt that you will have any issues with the other side of the cats. If you have problems removing them, go to a body shop and let them use a torch to remove it.

 

got a video where you can hear the exhaust on my car. just playin around leavin my buddy's house after we went for a drive in my Z and his Nismo.

 

^I'm sure it sounds great in person but that video definitely doesn't show it.

 

yea thats cell phone video. the video was without test pipes too...that was back when i just had the injen exhaust and cold air