Quote Originally Posted by Vteckidd

Quick question, who on here has EVER seen a BURNED exhaust valve on an NA car?
I have seen a few. The open header will not cause damage to your exhaust valves. If you run your engine with no header or manifold you will damage your exhaust valves. V8 cars can also run with open header and not damage the valves. I did an experiment one time and dropped the exhaust off one of my cars at the track. I got no improvements except a couple of hundreths off of et(probably due to less weight) and it was a lot louder. Properly designed exhaust systems will definately flow almost as good as an open header.