The tuner! Should be first on the list!
Definitely.....You can spend $350 on a tuner that gives you 55ftlb or a cai that gives you 2....it should be very straightforward lol...
I have the superchips and love it. I've actually heard great things on this forum about the diablo sport, however, my friend had one on his ls1 camaro and had alot of problems with the timing being too advanced during start up(he would have to try and start it 3 or 4 times to get it to fire), then when he floored it it was way rich and fuel would come out his exhaust....he switched to superchips and ran better at the track and got rid of those issues. With that being said, I've never used diablosport, and do not exclusively promote superchips(even though they are my hometown tuner co), lol