This is kinda like the ATS plug but is tapped for a boost elbow. I'm running one on the HE351 im installing for my twins. $40 + shipping. comes with the O-ring. PM me for more info.
Still selling them man? Just did my swap and my HE351 won't make more than 26-28psi, this and an adjustable boost elbow should fix that correct? please pm me as I can't pm, because of low post count. Thanks