Just my opinion...i would go for maybe the x-force dump/front pipe and hi-flow cat, but cat-back, i would go for a japanese setup, there is no comparison for the kindda sound n quality u get for wot u pay in a japanese exhaust...esp after a longer period of time, the japanese exhausts show their quality by still packing that same sound with punch as these other exhausts start to get noisier n dont perform as well...
Besides brandname, its the amount of money thats been put into the R&D of japanese products that make them better...even the materials used n all...the japanese have been meticulous abt the smallest details that improve a car's performance esp aftermarket parts..the simplest most minor differences set them apart...
The notes emitted from japanese exhausts are always sweeter....soundwise its a hell of a difference.