I've read the threads on these two mods and am wondering:

Are these mutually exclusive or complimentary?
Does one add to the other or not?
Is one more effective than the other?

Any comments from those who have both, or one or the other would be appreciated.

Thanks.

 

You will get a lot of input on this as folks chime in. I have the sprint booster, and it's great. However, the SB does not increase your horse power. It only eliminates or greatly reduced the lag when accelerating, while the ECU mod increases horse power by about 20. So in that respect I would say they compliment each other. This is a base explanation from 25,000 feet. I'm sure you will get more advice from others that are more technical.

 

You nailed it right on the head...

 

FP and HDDP are correct, I have both and can't say it any better than FP did other than I removed my Sprint Booster and tried the Speedinnovation tune alone because SI thought I would no longer need it, they may someday correct throttle lag with their tuning but that is not the case today so I reinstalled the SB. I highly recommend both mod's by the way.

 

I have both, a Renntech ECU & pulley kit and a Sprint Booster on my SRT6. But I can't really give much input on the Sprint Booster because I installed the Renntech kit before I drove the car with just the Sprint Booster. But I can give you input on a Renntech kit, AWESOME! I gave a friend a ride in the SRT6 yesterday and he was amazed, he said "man, this thing would eat-up a Vette".