It isnt overpriced at all if you dont mind having some money tied up in it for a bit.
my gruppe m cost £400 2nd hand. made my car run at 211bhp with just the intake as a mod, sounded epic and then sold a year later for £500
the tegiwa one is £350 and you will lose money selling it, plus it looks like a POS compared to the GM. ultimately it does the same thing though.
if your mate wants the noise but not the expense, go for the K&N typhoon or AEM or something. GM will be best for gains if he is looking to add RBC, race mani & hondata at a later point.
cheers again

shall discuss with him a bit more then
he did say, to him the GM and tegiwa one (if it is the other he was on about) looked exactly the same so if it does the same then he'd be happy with that as he can't really be bothered waiting/hunting for a decent priced 2nd hand GM.RBC....race mani.....hondata......all of my wuts? o.O haha (ok, google helps me understand things
) but I'm not sure if he does have anything else in mind after this/down the line.

