UNGN is right on the money !!! And it only takes about 5 minutes to install . ATR charges $39.95 for the Valve and $5 for shipping .
And install it with a grain of salt . They told me that one turn of the knob was worth 1 1/2 lbs of boost (WRONG) Not in my case . I started at 14 lbs of boost with the valve at full bleed and went 2 full turns thinking it was going to be around 17 / 17.5 lbs . It jumped to over 25 lbs of boost I backed out of it and started over with only 1/2 a turn at a time . This works well, I'm at 19lbs and 24* of timing with alky
And install it with a grain of salt . They told me that one turn of the knob was worth 1 1/2 lbs of boost (WRONG) Not in my case . I started at 14 lbs of boost with the valve at full bleed and went 2 full turns thinking it was going to be around 17 / 17.5 lbs . It jumped to over 25 lbs of boost I backed out of it and started over with only 1/2 a turn at a time . This works well, I'm at 19lbs and 24* of timing with alky
