Like i said just remove the airbox that is the engine cover that'll make it loud. Or you could so into SPT **** pipe technology (search in the mk2 section for more info)
 
Im sure if you drove it without it on it would be loud, but i hope you didnt drive it without it on. A green panel won't make it much louder. Your only option for loud is an induction kit and a decat and straight through back box.
 
get a new loud exhaust ? and bang a K&N on i have one (took it off got annoyingly loud) but they both work well together
 
Holy Pantaloons please tell me you didn't drive with the airbox off.
I might actually as for this threat to be stickied!
Press Alt + F4 For maximum win!
 
Holy Pantaloons please tell me you didn't drive with the airbox off.
I might actually as for this threat to be stickied!
Press Alt + F4 For maximum win!

nice, how many people fell for that one :) lol