Heavy Breather kit M8 - Road Glide Forums
ECM/Fuel Management systems ECM/Fuel Management systems For Road Glides

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post #1 of 6 (permalink) Old 09-03-2017, 08:14 AM Thread Starter
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Heavy Breather kit M8

I thought I'd pass along some observations about Screamin' Eagle air filter kits. I had the High Flow stage 1 kit installed by the dealer on my 2017 Road Glide but I never liked the looks, uses the stock cover. It rains here in Florida a lot and there is no rain sock available. I bought the Heavy Breather cone shaped kit but my question prior to installation was whether the ECM had to be retuned as the kits and airflow are different. I truly couldn't find any answer. Dealer unhelpful.
I installed the Heavy Breather kit this week. I've run it 200 miles. It has a deeper intake sound and seems to make the exhaust note louder, too. It sounds better overall. The performance seems mildly but noticeably better. There is no popping or signs that the ECM needs to be changed.

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post #2 of 6 (permalink) Old 09-03-2017, 08:57 AM
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Originally Posted by Bunny007 View Post
I thought I'd pass along some observations about Screamin' Eagle air filter kits. I had the High Flow stage 1 kit installed by the dealer on my 2017 Road Glide but I never liked the looks, uses the stock cover. It rains here in Florida a lot and there is no rain sock available. I bought the Heavy Breather cone shaped kit but my question prior to installation was whether the ECM had to be retuned as the kits and airflow are different. I truly couldn't find any answer. Dealer unhelpful.
I installed the Heavy Breather kit this week. I've run it 200 miles. It has a deeper intake sound and seems to make the exhaust note louder, too. It sounds better overall. The performance seems mildly but noticeably better. There is no popping or signs that the ECM needs to be changed.
I tuned mine with a FP3 and the stock AC. Then added the heavy breather later. No issues. I doubt that you'd need to also. If they used a canned map from the moco I'm sure if they did that'd only be extra mo st to reload the same map.


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post #3 of 6 (permalink) Old 09-03-2017, 09:14 AM
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It rains here in Florida a lot and there is no rain sock available.
Central Florida here, and also running the SE Heavy Breather (with no sock) for about 4 years. If asked previously, I'd have bet a testicle on rain taking the thing out, because I just didn't see how it couldn't. ...But it don't.

I've been in several downpours (Florida...) with it in the past 4 years, and it has yet to ever miss a lick...even when (making a run for it) pushed WFO.
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post #4 of 6 (permalink) Old 09-03-2017, 09:52 AM
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Originally Posted by Bunny007 View Post
I thought I'd pass along some observations about Screamin' Eagle air filter kits. I had the High Flow stage 1 kit installed by the dealer on my 2017 Road Glide but I never liked the looks, uses the stock cover. It rains here in Florida a lot and there is no rain sock available. I bought the Heavy Breather cone shaped kit but my question prior to installation was whether the ECM had to be retuned as the kits and airflow are different. I truly couldn't find any answer. Dealer unhelpful.
I installed the Heavy Breather kit this week. I've run it 200 miles. It has a deeper intake sound and seems to make the exhaust note louder, too. It sounds better overall. The performance seems mildly but noticeably better. There is no popping or signs that the ECM needs to be changed.
For starters the first intake you had didn't need a rain sock because it has a cover on it. The rain sock really only works for exposed air filters while sitting out in the rain to keep the water form building up in the intake. If you are moving and with the engine running the water is taken in as a mist that turns to steam inside the combustion chamber and can actually help clean the pistons. Only a lot of water at one time will cause the engine to misfire and can possibly cause damage. A lot of old timers used to use a spray bottle and spray water into the intake for this purpose and many people till do. I've ridden thousands of miles in rain with and without a rain sock and never noticed a difference. You just don't want the bike to sit out in it with an exposed filter.

Second, The first A/C allowed your engine to suck in it's maximum amount of air already so adding a larger A/C did not add any extra airflow and thus will not change the performance. If you like the filter better that's all that matters so enjoy it and don't worry about the tune because it didn't change anything from that aspect.
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Last edited by RGKen; 09-03-2017 at 12:44 PM.
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post #5 of 6 (permalink) Old 09-04-2017, 07:26 PM Thread Starter
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Thanks for the opinions, all good. I really wanted the new cleaner for aesthetic reasons, and I'm happy with it.
But I think rainwater can still be a problem. I was caught in a fierce rain storm and the water from the road funneled directly into the open air cleaner. Going up a bridge the engine coughed and sputtered. I had to stop and wrap a bandana around the intake. It maybe helped. That's why I thought a rain sock might be helpful.

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post #6 of 6 (permalink) Old 09-04-2017, 07:36 PM
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K&N makes rainsocks. Different shapes n sizes. Look on there website, you may find something that fits.
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