I had the 2 throttle bodies on my hemi. After 2 years and accumulating 1400 miles on the unit I got stuck at a gas station and had to have the car flat bedded home. I sent it back to Fitech and the ecu went bad. They replaced it under warranty or it would have cost me almost $400 to fix. Since then I put carbs back on and no problems. I just lost faith in the unit to put it back on. I ordered the Edelbrock pro flow 4 and waiting for delivery at the end of January. Car ran okay when it was running. Car would not start Hot, but next day started alright, but again no hot start after driving it. There's a Fitech forum that you can get some good info on, but not for me. I think I got the biggest unit they had at the time because of the Hemi and maybe look to increase power down the road.