[strokeittwice443]

i run at or around sea level every where i go and ive got 20's in my cool head. ive never had any dealings with a noss head but im sure their fine. i believe that you can get the noss head in different colors and the cool head only comes in aluminum, so with that said i guess its down to personal preferance. you souldnt have any problems with the 20's at lower altitudes.