injen and aem are essentially the same product. i believe, and correct me if im wrong, the creator of injen was before hand an engineer or designer for aem. both are great products and it all boils down do what u think looks better and price...
ive been using a cheap ebay intake cold air intake... and its worked great.... only thing i will eventualy swap out is the air filter.
i dont see why any other brand would be beter... its a smooth pipe and a filter on the end
only thing that might boost performance alittle is to wrap the intake tube with some insulating material to block out the engine heat alittle beter.
i know the V2 has like an extra layer tube near the filter that supposedly flows air better, i cant explain it like some people on here...but its like the 'Next' think..ya know?