I have the Shorty headers, O/R Xpipe, and 40 series flowmaster mufflers. I was wondering if it would be worth it for me to upgrade to the american thunder catback system, but with the same mufflers i have now. Will my performance increase at all? and will it sound better than now? thanks guys.

 

I dont think it will really do anything except for upgrade the size of your pipes to 2.5 inches. Its prolly not worth it. Just keep what you have and us ethe extra cash for something else. Just my $.02.

 

Save the money and spend it on something else.