As usual, very good information Doc. M8 heavy breather is not at all as good as twin cam heavy breather. Was curious about the Extreme versions, had heard they were good, your post confirms it.
The heavy Breather is basically the same, but the M8 doesn't react to increasing the intake length like the Twin Cam did. When comparing air cleaners, I always speak about the power loss not gain. I run the baseline dyno pulls with an open TB, looking at the butterfly. 99% of the time this will be the best number you will ever see. As you bolt on different air cleaners, you see the loss in power from the air flow restriction. In all of my testing with Twin cams, the SE Heavy breather is the only AC that actually showed a TQ gain through the mid range with just the addition of the elbow. If you ran the big filter that came with it, you maintained the gain, or "zero Loss". The Twin cam likes the additional intake length. The M8 on the other hand could care less. The elbow alone shows no gain, and the addition of the filter usually dropped it back 1-2 HP. It's the same AC but the 4 valve motor just doesn't respond to it like the Twin cam did. Right now, the best ACs for M8 are the ones that flow air through the face. This allows the air to flow straight in like an open TB. Complete opposite of the stock M8 CVO ac that forces the air to make a very sharp 90 deg turn. As usual, Doc knows what's up.
Steve@fullsac.com
Did I mention we have a new long primary M8 Sportpipe coming out? It's a secret, don't say anything.
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Topic: Stock Injector size on 2018 CVO (Read 6038 times)