[RICK LAKE]

Peter Allen Peter in simple terms tuff answer. We at this point don't have real weight in the car. We need your weight, full tank of gas, spare tire if added. From there it depends on the rear suspension design and angle of struts or shock and springs. If you are staying with the N30, can you find another car and measure the top of the tire to the body edge at the closest point. With out seeing it, a 2"-4" clearance. It depends on spring rate, size of rear swap bar, strut adjustments, ratio of rebound to compression. We also need to take into account road surface and if you can find one smooth in the US. I would go with 4". you can always cut the springs to get a look or better wheel to body clearance. It's alot harder to not have enough clearance and can't go the other way. The couple of pictures I have seen of GTO car show about 3-4" on the rear but we don't know how much gas, weight of driver, and "g"s the car is or will pull. I have seen more car dropped and the outter side of the tires cut from bottoming out and loosing tires for this reason. It's easy to drop the car, it takes a suspension kit to do the same and give you the solid handling ride. Rick L. Ps there are suspension CD on the market for seting up your car with weights and everything. They are about $40.00.