The X-Force IMO sound a little tinny and is made of lower grade of stainless steel as well.. Ive had an X-FORCE next to an APS and the quality of the X-Force is no way near the quality of the APS.. Take the Y pipe on the X-Force where the cat finishes and it splits into twin 2.5 pipes! You will see exactly why you are paying $1400 for a polished stainless steel exhaust system and getting what you pay for.. I know of a few people that refused to put it on until they cut the Y piece off, ported and smoothed it then put it back on the system.. Power wise the X-Force may outflow it on the dump pipe side BUT there are cars that make 400RWKW with an APS exhaust system using the 3" dump pipe and run 10s all day.. Downside of the APS system is the cat!!! Shocking... I had one that the metal element came loose, tappered itself to the shape of the flange and wedged itself into the flange. I know of may people that say to hell with it and gut them... Your more than welcome to come and have a listen to my APS exhaust both at idle and at song... Good luck in your choice..