me, i'm more interested in hp than sound. an older thread here, had a member, completly replace, oem exhaust, with about $1800. stainless system and only obtained 18 hp increase
for the K&N CAI, around $250, you can conseratively get 7-10 (K&N claims more), but I've yet to dyno
you want loud, go get a couple exhaust cut outs ($50.) each, and some electric power plates ($125.) each, and you can be loud, mild to wild, whenever, however you want. open, they sound like friggin NASCAR
with them open, you'll lose a little on the low end but wind it up and easy 10-15 hp gain
had'em on my SS