i just bought my car a few weeks ago and it was fine then, now i have a rattle which i thought at first was my baffels in my muffler, turns out its the pipe infront of the catalytic converter, and if i push lightly on it the rattle goes away? any tips on making this stop??

 

Buy an RS*R ExMag exhaust. But in all seriousness just jam something in between whatever's rattling. Like duct tape usually does the trick.

 

It is probably the heat sheild between your cat and your resonator. You can cut it off if. It isnt too hard.

 

make sure you have a spring loaded bolt kit connecting header to cat or test pipe or resonator whatever you have there