spool is better than the injen because spool supports the members on this board. it's also made of ss instead of Al. i have not heard of aem's v2 being available for the msp, however, the v2 has many applications for many other cars, mostly in the honda/acura lineup. and a cai is a cai. as long as the bends are mandrel, as long as the tubing is of correct diameter, it makes little to no difference.