A few days ago Underground Racing unveiled their twin-turbo Ferrari 458 with 700 rwhp output. It was superb. Now Heffner Performance has come up with a similar package, which on pump gas generates 820 HP / 700 whp. Both of these kits are the tuners first crack at the 458. More powerful programs are already in the works.

Check out Heffner’s 458 after the jump.