yeah mate china ones are fine if you are making stuff all power, but for people who want good quality, awesome welds and a product that is actually tested and developed then they buy a name brand one. Ones like pwr, plasmaman, hks, trust etc all have better core designs which flow better and keep intake temps lower. Plus if he decieds to smash a big single on their, he know that he will not lose power through dodgey design.
but if you want to keep ur china go right ahead.