ok, just recently purchased and installed kinetix hi flow cats. love the sound but what's with the pipes not having any brackets to be attached to the bottom of the car. they basically just hang by being attached to the exhaust with bolts. looked at random technology - same thing. was driving all day today and now the exhaust rattles. don't like it at all.
i know there are a lot of people here with test pipes/hi flow cats. do you have the same problem? if so, what did you do fix it?
on the fitment issue - everything worked out just fine. (i have x version)

 

Losing the brackets should not be causing rattles. Double check all your fittings , torque specs, and also check out the typical suspect areas like the aluminum heat shields, rear muffler air dam, etc, and I'm sure you will find the problem...

 

Regarding the fitment issues... http://www.my350z.com/forum/showthre...hreadid=112675

 

I took it to an exhaust shop and had them weld in another hanger. Without that brace there is nothing to support the exhaust until the rubber hangers in the rear. My Borla exhaust was hitting the rear cross-member whenever I went over a bump.