I had NSR comp cams 127200 installed today. I had AM write the tunes. I first ran it with the 91 race tune. Perhaps the tune is off a little or I need to get use to the cams but it's hesitate down low. I have 4.10s and I can barely start off in 2nd gear. I tried going up a steep drive way and the car barely made it up. It did throw two codes P2196 (02 sensor stuck rich bank 1) and P2198 (02 sensor stuck rich bank 2). I tried the 91 per. tune and that tune seems to work better; although, it throws P0172 (rich bank 1) and P0175 (rich bank 2). I will contact AM on Monday. Now as far as sound and performance. There is not as much lope as hotrods or thumpers but that's to be expected. There is however more lope than I thought, which is a good thing. After 2500 or so RPMS the car pulls hard.