As far as subs go, you don't know amazing until you've heard a DD. My personal opinion, of course. I still have a 2515 waiting to go in one of my cars, probably the GP. I was impressed with the type R 12's I have though; they've taken some serious abuse without any issues (I was feeding them 1500rms for the better part of a year, 20hz bitchslaps and all, and the cones are still stiff as heck.)