The new M4 Low Boy Honda Grom Exhaust is a stainless steel full exhaust system that features a black ceramic coating. The company says the system improves the sound and performance of the mini-streetbike from Honda, as well as the appearance. The exhaust system comes with a removeable quiet insert installed from the factory. Suggested retail is $329, from dealers. For more information, contact M4, Dept. RW, 2227 Joe Field Rd., Dallas, TX 75229, (972) 481-9300, www.M4exhaust.com.