Actuly its better on the vert adapter. as many of you know, there is a small but measurable preformance increese with the "extended" valve caps. Any of you that work with hot rod motors will understand the concept of "ram tuneing" To grossly over simplify, a longer colume of air will keep moving by the valve even when the vlave is almost closed.
I won't bore you with a lot f theory, simply stat that many fokes have found that changing only their valve cap can have a slight increese in veloicity.
Now when you hang a LPR on the end of the valve cap, you are actuly putting a "drain plug" at the wrong end of that colum of air. and you have the solonild "demanding" air from the column of air that the valve is demanding air from.
But frankly-- its just a whole lot easier to mount on the vertical adapter (not to mention you can still use a cool looking valve cap)
The resion SP does it on the valve cap is that to mount it on the vertical adaper, you no longer have a PRV. Now my theory is taht we are using low pressure hose off the LPR-- so in an over pressure situtation, the air line will Blow off
We will be doning all your LPRs from the vertical adapter
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