An axle back exhaust that improves sound, performance, power, fuel economy and the fun factor is the best Blazer exhaust choice. Yes, there is one axle back that can provide all these things - the MRT Sport Touring exhaust. Designed for improved exhaust flow with less restriction translates to power and performance increases. Also, all MRT Exhausts are made from T304 stainless steel which is the highest-grade steel for exhaust corrosion resistance.