The AWE Performance Exhaust smooths the tone of the AWE Performance Catalysts, taking the soundtrack to a high - pitched, goosebump provoking exotic note. The Performance Exhaust is constructed from full 3 mandrel - bent T304 stainless steel and features an engineered opening between the banks, aiding to the signature tone. Surrounding the AWE Performance Exhaust is a mandatory OE quality custom - engineered quarter - inch thick, dual - layer waffled Inconel heat shielding with internal 3000F matting to prevent any heat damage and protect the 570s body paneling. This exhaust re - uses the factory tips. It's not easy to make a McLaren better....