That was a very quick LS1 swapped RX-7. I tracked a couple of those FD chassis for a couple of years for a customer, they are probably the best handling car I have ever driven on track.
Once we get our power to weight correct for ST1/TT1, it won't even be a contest next time we are on track together
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We are currently running an adjusted 6.6 lbs per HP (adjusted for tire size and compound mainly by the NASA ST/TT rules) out of an allowed 5:1, so we have lots of room on the table. Next year with a new header setup we are hoping to be putting down more like 440 WHP, loose a little weight, and add a sequential gearbox and we should be right at our 5:1 allowed.