it is not a good exhaust break and should not be used as one.
read why on php's website
if its cold outside start your truck and let it sit for a few minutes.
you should hear kick on, makes your exhaust sound plugged. (cause it is plugging it)
Yes like stated above do not use as an exhaust brake unless you have both upgraded valve springs and bellowed up pipes. Even still its not the greatest idea. Although you can wire it to a single pole double throw relay like i have then you can use it to warm up the truck faster.
Yea im just wrapping up my DIY high idle so that combined with my ebpv my neighbors hate me in the morning:hehe:
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