i have the kinetix test pipes on my car and the stock exhaust and it makes a wierd hiss noise any ideas? also if i were to put the stock cats on with a cold air intake and plenum spacer would that be a problem like to much air? and not enough going out

 

the hiss is because u have grater airflow listen to my turbo xs test pipes i have a cold start vid a warmed up one and a drive around.

cold start:
http://www.youtube.com/watch?v=zv04740iM5M

warmed up:
http://www.youtube.com/watch?v=RvdmY...eature=related

drive around:
http://www.youtube.com/watch?v=6-Qux...eature=related

the drive around you can hear it the best they ARE broken in when i took this video

 

hiss with TP is normal, so is usually rasp, and a metal slappy type sound.

 

perfectly normal. just tell people you installed a couple of snakes under your car and they likes to hiss once in a while.

 

Probably need new gaskets.

 

thanks alot guys also if i put my stock cats back on with the plenum spacer and cold air is that gonna be a problem?