Yes they help with throttle response. Mine actually runs better with the heavy breather then it did with the big sucker. Its much smoother now when accelerating.

 

Cool, thanks. I hate to blow the money but that alone would make it worth it for me. Nothing worse than hitting the throttle and then maybe it wakes up...or not...before releasing the clutch.

 

I don't think it is just sales that drives the MOCO to say that intake is recommended for the 120R. If it was just sales, they could just come out with something new and charge the same price as the heavy for it and say it is a mandatory add on the the 120R. I notice a good increase in torque when the air is cold and it's more than with just the stage one intake.

 

I just rode home from the dealership after my 1600km tuneup. I had them add Screaming Eagle slipons as well as the Heavy Breather and then they retuned to match.

Significant improvement in performance. More than speed, the bike feels HAPPY now. The 103 was always quick enough for me, but it felt like it was really working to make speed. Now it feels effortless. 3000 rpm feels smooth where before it was rough.

Runs much smoother, belches just a hint of black when you crank it, sounds much nicer but not V&H loud. My wife was gleeful when I cranked it - she gets giddy with acceleration and this made her happy.

My opinion, based on having just done the job an hour ago is that it is well worth it.


Do it.

 

I had my bike dynode with a stock high air-flow a/c and the SEPST and it made 74 hp. I later added the SE heavy breather and it dynode at 77 hp hope this helps.

 

I had the HD Heavy Breather on both my Sportsters then went with the Big Sucker on my FXDF.... lovin' it so far.

 

I put one on a 42MM mikuni carbed 95" Dyna with a built motor that had the regular SE breather kit. I had to go up one size on pilot jet and 2 main jet sizes and the bike ran very very much better. My results would not be typical for this engine flows very well and it turns out the Heavy Breather was the magic combination. It seems to be cooling the intake air from a vacuum effect from what i can feel with my hand on the intake runner. Cooler air is of course more dense and the reason for the rejetting.

 

Performance

 

Maybe a dumb question:

I have a Big Sucker and Thunderheader, and tuned with Powervision. VERY happy with performance.

If I switch to Heavy Breather do I need to re-tune?
Or is one open air filter pretty much the same as any other?

Only considering changing because I had one given to me and thought I'd try it for awhile only if it didnt mean re-tuning....

Thanks in advance.

 

One High flow A/C is just as good as another. Really no difference in air flow capability.You shouldn't have any problems or need to re-tune.