well the ic debate goes on

firstly ive got a grs so my opinion isnt buyist,grs on mine is good,but i have been told that i need a single pass one for reasons that alex said,it struggles to keep boost held high up in the rev range and was told to go for the pace front mount as its acts are top notch and still single pass with a huge coolin area
id go for the pace one if money is no object if not grs is the best of the rest
or you could always get some cossie ones welded up and a reverse charge pipe made up,better than all quoted above