Peedee

iTrader: (4)

Got a 2006 sti with the standard sti backbox. I'm looking for something I can put on that has just a bit more noise so I can hear the burble but isn't ridiculously loud, Just a little louder ;-). I don't want to replace the entire system or the cat.

d4nnyc

There are plenty of second hand ones like Prodrive, Scorpion and Hayward & Scott which are only slightly louder than stock. I've got a Scorpion one and it's almost the same as the stock one on tick over but sounds good on acceleration.

StiX

iTrader: (4)

Milltek? Have had them on my last two Imprezas and they are excellent and exactly as you describe - louder/burblier (think I just made up a word?) but not too silly. Quite pricey new though.

scotty boy 80

iTrader: (5)

If it's got all the cats in and resonated centre still you can take your choice of bbox and it won't be too intrusive