Beau when will you be updating the info you have on the thumper kit????? I'm going for one of the kits but Im not sure if I want the sleeper or the Thumper kit...I guess It's based on my $$$$ situation but then again I dont want to decide the thumper kit is too much for me and miss out on the clutch deal coming with the sleeper kit.
what are your end goals? is the car ultimately for the street? do you really need the (very) high horsepower of the thumper kit and its GT30, or is it more for bragging rights or for the show quality mani?
in all honesty, the SS kit is just that, much better for the street... much quicker spooling and low end grunt.
I have one supa. It will be more streetable and more of a daily driven car, I see the thumper in completely built cars, it will NOT be cheap once you throw engine management into the picture.