The APEXi N1 series cat-back exhaust system has become a staple of the import tuning industry. The N1 was the first of its kind to incorporate the angled muffler design onto a cat-back exhaust system that has became so familiar with today's street cars. Born from APEXi's involvement in the grueling N1 endurance series, the N1 exhaust system pairs a straight through design racing muffler with free flowing, mandrel bent piping (60.5mm for N/A applications, 80mm for turbo applications). This combination has resulted in dyno proven horsepower and countless satisfied customers world wide. Designed with track use in mind, durability is of utmost importance. The polished SUS 304 stainless steel canister features robotic TIG welding for an immaculate finish and years of reliable performance. Constructed of mild steel piping which is then treated with APEXi's special high temperature titanium particle coating to prevent corrosion.