I believe the coating is to keep the heat in the pipes so the gases exit quicker creating less back pressure. I've heard of coated headers. Keeps the engine cooler and helps the gases flow out. Are you talking headers? I'd probably pay the $25 anyway.xxkazp3rxx said:The guys that im goin to have install my exhaust quoted my 2 differant prices for the pipes.. coated and non-coated... there's about a $25 differance in the price.. what's the differance? Pros and cons? is it a good idea to put out the extra 25 bucks to have it coated?