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I really think there is a substantial difference in terms of quality. I remember when Wyatt was back on the baord and he had made several attempts at using various check valves without much success.
I think a heavy duty enough check valve would work the same as the ML, however, it does have to stand up to quite a bit of abuse. The ML mates directly in between the Manifold and the MAP sensor, so there isn't any delay for the MAP sensor in receiveing the appropriate signal or any dangers of vacuum leakage due to cracking, splitting, or generally poor quality vacuum lines.
I've had a couple of opportunies to inspect the innerds of the ML, and it's nothing like typical $2 plastic check valves or PCV valves you normally see, this baby is of top quality.
On its exterior, you will plainly see the smoothly cut alminum that makes up its housing. It fits so perfectly in its mating to the intake manifold, that you'll swear it's stock. Additionally, a quick glance at both ends of of the ML will also quickly reveal a number of nicely fitting valve parts, made up of synthetic compounds, and rubber fitaments that compose the necessary valving to allow vacuum to reach the MAP, but not boost.
Being a person who has had more than their fair share of hardships, acceleeration issues, CEL's and resulting fueling problems (with detonation included) all due to defective, non-dependable, unreliable, underperforming voltage clamps, whether they were produced by HRC or SplitSec, I can not issue a strong enough seal of approval to a product that, although simple in theory, does its job so splendidly and without worry or issue. (how's that for a run-on sentence!  )
Get it! _____________________________________
Jason ESi-T
04' BMW 325Ci
91' Nissan 240SX
98' Eagle Talon ESi (sold)
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