Intakes such as the Injen/AEM short ram and CAI's are loud from my experience. If you are after a loud intake, definately don't go for brands such as Comptech and Mugen which are enclosed air boxes. If you are interested in Injen, PM me for further details.
if you want sound just rip the cover off the air filter box and expose the pod, my girl friend got pulled over by cops cause her car was too loud after i had just taken the cover of her air box, and its a lot cheaper than buying new pipes
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