hmm, thats not a "header", http://www2.towerhobbies.com/cgi-bin...&I=LXEUM8&P=ML thats a header. Your point is made well though... i have that same design on my garbaged 2.5 i inherited. looks like it works well, i never asked the guy if it did, i kinda ditched the engine lol, its a necklace now.