Bought a GFB DV+ from a forum member and finally got around to installing it today. Those bolts are an absolute PITA to get to. Not a hard job by any means (literally 3 bolts and pliers) but it still sucked because I didn't have a swivel socket, just a semi bendy 8in extension. A little louder than stock but won't grab any unwanted attention. It's actualy quieter than I expected. Car feels smoother between shifts, can't speak for power gains, mainly because I just reflashed from E30 to 93 so the car feels slow regardless. My RT660's are at 4/32nds so they can't even handle 93 torque lol. Driving around the car feels smoother between shifts.