is there such a thing? i found something close http://www.tweakit.net/shop/product_info.php?products_id=917 but i want to be able to control what the boost level is in the last stage not just get 10% extra. and i would rather a manual one too
what exactly are you looking to do ? trying to do like 5psi in first, 10psi in 2nd and 15psi in third ?
I beleive the apexi avcr has gear based boost control so you can set it so you can keep traction