A: The 2002 Maxima, 2002 Altima, 2002 G35, and 2003 350Z all share the same VQ35DE engine but are tuned slightly differently to produce various levels of horsepower. The Altima's intake and exhaust leave much to be desired stock but a few mods will grant a lot more power. The Maxima has a bigger intake but lacks a good exhaust system. The G35 has ram air and cold air. The least restrictive intake is found in the 350Z. Redesigned intake ports, a virtually aftermarket CAI, increased valve lift, and a decent exhaust system put the 350Z in competition with cars twice the price. The Z is rated at 287 horsepower and 274 ft-lbs of torque vs the G35 sedan's 260 hp/260 ft-lbs and the G35 coupe's estimated 275 hp. These RWD cars both feature a 6 speed manual with short throws and precise gates or a 5 speed fully sequential automatic transmission. The Z also has a carbon driveshaft which is quieter and 40% lighter. Both cars can be driven from the dealership to the track with their fully independent advanced multilink suspension system. The Z suspension is a designed to handle the twisties better with stiffer spring rates and extra bracing while the G35 gives a more comfortable balance between comfort and handling with it's longer wheelbase. Weight advantage belongs to the Z at 3200 lbs, about 130 less than the G35 sedan. Aerodynamically, these cars were designed to fly down the track. Both cars share 0 degrees of front lift and small coefficients of drag (0.3 on the Z and 0.27 on the G35 sedan). If you want a car ready to race straight from the showroom (and you only have one friend to sit in this two seater), the 350Z offers what you're looking for. If you prefer refined but still aggressive tastes, you should save a few more grand and head to the Infiniti dealership. Having been in both these cars, I can say you won't be disappointed with either!