This has been reported pretty widely on another forum, but I haven't seen much discussion here: Under hard driving, many (I wouldn't be surprised if all) aftermarket exhausts will rub on the axle if you are on coilovers or low springs - potentially even PASM guys. Next time you are under your car, make sure to check, especially the passenger side!

Here's what I originally saw:





The guys at Fabspeed were great and shipped me new pipes that resolved clearance issues:

 

Good to know.... What are you running suspension wise?

 

JIC coilovers.

 

good info!! thanks!!