Changed my standard MY99 classic intercooler today for a 01-04 WRX type. Fitted a Bailey DV12 to it but it doesnt seem as loud as the dv10 on the old intercooler and doesnt give off as much noise untill higher up the revs?
have noticed a definate increase in perfomance tho.

 

its your imagination

 

unsure! deffinatly used to let of alot earlyer down the revs.