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[grc]

After cutting down the filter, it appears you would have no more surface area than the Ventilator filter and possibly less.  Short of doing flow testing or back to back dyno runs, how do know the HB is flowing more air than the Ventilator?  Or is that an assumption on your part?

Jerry

[RivRaptor]

I agree in theory with your statement, yes there seems to be the same or even less filter area before I trimmed a little off.  But other factors are at work here. In the ventilator air cleaner air has to make a tight 90 degree turn with part of the cover obstructing flow, in the Heavy Breather it has a longer curved intake runner and due to the taper in the filter air has almost a direct shot through the filter.  Longer intake runners generally make more power.  After installation I noticed considerably more heat coming off the motor on a few short local rides (didn't sump) as well as more intake noise.  Threw a new tune on with a little more fuel, back to normal.  Butt dyno says it feels a little crisper on the throttle.  I did this install to see if I could get it to fit because I'm planning on doing a 124 build soon & all research I've seen points to needing a HB.  Besides it looks bitchn!

[FLSTFI Dave]

From what I am seeing on some of the professional builders web sites, with the 124 M8 the heavy breather in stock form you loose 3 hp and 3 torque over no filter.  They are using Non-HD filters.  I am hoping to see a test of the new HD extreme flow filter set up.

[RivRaptor]

I also agree with you Dave.  I know this is not probably the best / most HP filter available.  Hell K&N's are basically rock catchers anyway.  I'm factoring in the look I want, also I'm planning a conservative 124 torque build so I'm not gonna sweat a couple hp's in the end.  As I have noted in earlier posts installing this cleaner on my bike with stock ventilator defiantly leaned out the bike (114), so this should move enought air to handle my 124 needs.  We will find out for sure after I have Steve @ Fullsac tune it when I'm done.  I'll bring the ventilor for fun too!