Pics of dyno sheet? Car? Suppliers of parts for theis Group 3 package?
There is a reason why no one races Box
S ter S's in any major competitive racing series: They're not competitive. Show up to a track and show me some lap times, then compare them to, say, SCCA times. My guess is, giving you the benefit of the doubt and assuming you're a decent driver, that your times will be equivalent to mid-pack T2 times, never mind T1 times.
If the car does exist, let me know where you are. I'm sure I can find someone willing to take $3500 off your hands.
Sorry, just realized thread starter was (rightfuly) banned.
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2004 Subaru Impreza WRX STI (daily driver)

1999 Mazda Miata (track car, slow, but finished the SCCA Runoffs)
1987 Porsche 944 (being rebuilt)