Help! New catback problems after having it installed! Motor Mount inserts??

No offense, but this is why you buy QUALITY parts, not a $200 cat-back system. The amount of money a company spends in research and development affects their price. So you figure a $200 Tsudo cat-back versus a $550 Greddy cat-back the Greddy will win hands down not only in fit, but in power output also.