the g and the z are the same car g is more luxurious and heavier due to the extra seats..i have a g with gtr conversion and haven't had any problems other than having an issue with keepin back tires on it i have put my car to the ultimate test driving like i stole it all the time and it is a tough car but due to careless and wreckless driving i dont have a license anymore..best car i ever owned though by far