My car has a MS3 and I drive it atleast 3-4 days every week. Usually run into some heavy bumper to bumper traffic on the way home during rush hour too. I have 4.11s in my 9" and it is very driveable. I would definately recommend going with 4.10s though if you decided to go with the MS3. To me, my car feels like it would be a pig down low if I didn't have the 4.11s. I went with the PRC Platinum .660 valve springs w/ titanium retainers, Manley hardened pushrods, ported LS6 oil pump, and a new Rollmaster timing set when I had the MS3 installed. Also added a Powerbond pulley during the swap. I have plans to buy a good set of heads for it in the near future. I'll more than likely have to get the pistons flycut for the aftermarket heads, but I'm not worried about it. My rev limiter is set at 6,700, and that's about as high as I want to spin it with the stock bottom end. My car was dyno tuned by Gomer using HPTuners and put down 401 rwhp / 364 rwtq with stock heads, through the 9" with 4.11s and 315s on the back. I gained 62 rwhp with the MS3 and Powerbond pulley through the 9" over my stock cam and 10 bolt numbers. I'm in the process of upgrading my fuel system for a 150+ dry shot. From what I've seen the MS3 works great with nitrous, so I can't wait to spray it. I highly recommend the MS3.