its at 32 psi and feels good goes like fuck. ive got a bit of private road 0.8 of a mile with a sharp bend at the start of it and ive had 155 and stopped within this 0.8 mile stretch. dunno what head can flow but even if it was on its limit at 26 psi it must still push a bit more in id of thought with 6 psi more pressure. all i know of head is nms said middle of the road, so 410 standard and 550 for fully ported so if im in the middle should be around 480 ish ?