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Grassroots Motorsports 141 leak, it's most likely coming from the radiator expansion tank, the radiator itself, or sometimes the water pump. Don't be too scared by the list above. Many cars have already had these issues fxed, so records are important. Always get a pre- purchase inspection done by a BMW shop. It could be the best investment you make. Even if the car funks the inspection, it will save you thousands. Once you have a car and want to start improving it, suspen- sion and engine tuning are the place to start. Then, install bigger brakes, lose some weight, and add sticky tires, headers, and a supercharger or turbo. The pos- sibilities are endless. The most popular suspen- sion upgrades are bushings, and there are many options available. Heavy-duty rubber, urethane and solid replacements are the three main choices. There are also coil-over kits if you want to get more serious. Bilstein, Koni, K&W; offer quality options. Tuner kits from Turner, BimmerWorld and Ground Con- trol are also some good prod- ucts. To add more adjustability, camber plates and adjustable rear lower control arms are good additions. A good cold-air intake will add some power, but don't waste your money on a cheap version. A heat fence is a must, as hot air from under the hood will cost you power. Next, a new ECU is a good idea. It's not really cheap, but it will defnitely give you more power and torque while raising the redline and removing that pesky speed limiter. Exhausts are a matter of per- sonal preference. There are many good systems to choose from offered by Remus, MagnaFlow and Borla. Most create gains within 2 or 3 horsepower of one another, so you can pick the sound you like best and go with it. Once the fastest M3, the E46-chas- sis M3 can now be a performance bargain. Here' e shopping for one of these bargain super-sedans.