Related Photo Galleries
Next, we had an LS equipped with FAST XFI as well as FAST's LSX intake and 102mm throttle body. Getting everything dialed-in is a more time-intensive process, but the payoffs can be huge for those with radical combinations or power adders. XFI's Qwik Tune stores up to four different profiles, which are accessed with the flick of a switch. That means you can drive around town on a street tune and have multiple track tunes ready-a two-stage nitrous tune for example.