My father and I have both installed the BC ZR series kits on an R34 GT-T and R33 GTR. Both cars are road registered, street driven cars which are highly modified for track use but they are still true street cars with no weight reduction and we typically do various track day events with them, driving to and from the events when we can. Absolutely no issues with installation. We did have to raise the standard height adjustment to maximum as the track orientated kit naturally sat the cars extremely low to the ground. Some more standard height adjustment would make this kit the ultimate for an all-round package. The track handling performance out of both cars without any fine tuning has been excellent. The most amazing aspects have been how comfortable the suspension still rides on the street despite the ZR kit being a high performance racing orientated kit. Yet the stiffness where you want it and the precise handling feeling at the race track is awesome. We have been lucky enough to drive as fast as we can with the ZR suspension kit installed around reputable race track disciplines such as Barbagallo Raceway and even Mt Panorama, Bathurst. We have a great confidence in the suspension kits with both cars and we are overall very happy with the product and all of the customer support we have received. You can also view various track footage from both cars on the YouTube channel "SCR34MER444" to get an idea.