I just got my HKS Carbon Exhaust installed yesterday and I hear this rattle noise every time I accelerate. I noticed the exhaust piping was very close to the drive shaft and was notified the exhaust might expand and touch it once in awhile. Sometimes I hear it, and sometimes I don't as the piping is expanding due to the heat. Is there a way to fix this problem? or is it a common problem with the HKS piping? Thanks

 

You know a common problem with exhausts is aftermarket downpipes sometimes will make contact with the subframe bracing underneath the car. You may want to check your clearance on that as well to make sure its not something more serious