You always hear the old addage that running short, open pipes (like zoomies) on an engine will quickly lead to burned valves in the exhaust port(s)...but is this true or not? I've done it on mini-bikes and stuff like that and never saw a valve magically fry itself (what constitutes a "burned valve" anyway?!)...but admittedly...how far do you drive a mini-bike (okay, I used to take mine on 20-some mile trips, but that's still short work compared to what a car sees!)?! Back eons ago, I had a crappy VW Bug with NO exhaust on it...open PORTS only! I dove that pile a few months like that and it always ran good...just super LOUD with random flame shows at night! I want to make some short, open tubes for my current Bug-Based Bomb, so I thought I'd toss the question out there to see what the collective HAMB Bank of Wisdom thought of this notion! (Of course...Bugs can never be driven all that far either, so how much difference can it actually make, right?!) Anyone got any hard evidence to support this silly old wive's tale about burned valves...or is it just another urban myth??