Someone with BTDT, how well do these Wilwood brake upgrade kits work with the stock 4KQ MC? Any advantages or disadvantages to the Blau kit Vs the RPI kit? Any ideas why they call these 'race brakes' or 'not recommended for street use' but they supply street pads with these kits? (just curious) Please respond direectly, I am not on the big.list..... TIA, -glen