Muffler Upgrade Question - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 39 Old 02-19-2015, 03:11 PM Thread Starter
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Muffler Upgrade Question

Does upgrading to either the Screamin Eagle or V&H muffler require a change to the fuel injection settings?
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post #2 of 39 Old 02-19-2015, 04:03 PM
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Does upgrading to either the Screamin Eagle or V&H muffler require a change to the fuel injection settings?
I cant speak on th Screamin Eagle but I have the Vance and Hines slip on and I did not have to make a change and I double checked with two dealership to make sure.

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post #3 of 39 Old 02-19-2015, 04:11 PM
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You might not have to, but you should. The bikes come very lean. Increasing the air flow, either through a freer flowing exhaust (smaller change), or an air cleaner (bigger change), leans things out even more. The bike will run hotter, you'll notice a significant increase in the popping at deceleration, and the worse case scenario is burned out valves. Probably not something you need to worry about right away, but yes, as soon as you can you should either get a stage one tune or even better, an ECM controller like the FP3 or Dynojet. If you add the air filter it's definitely necessary.

I believe the Street does have an O2 sensor that should take minimal care of trying to keep the bike from getting waaay too lean, but someone should correct me on that if I'm wrong.
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post #4 of 39 Old 02-19-2015, 06:41 PM
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If it is only the muffler you do not need to have the stage 1 done or use a controller. Unless you change the air filter along with the muffler. Then you should get the stage 1 or controller.
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post #5 of 39 Old 02-19-2015, 08:06 PM
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You can use the Bassani, Vance & Hines and Screaming Eagle slip on mufflers without having to change the stock fuel set up. How do I know this, My dealership had 3 Street 750's set up with each different slip on so I could hear how they sounded. Now, if you change the stock air breather and increase the airflow with a Vance & Hines, Yes, you will need to add a fuel pack.

Btw, I decided to go with a Firebrand Loose cannon slip on muffler which is sitting in the box in my living room cause its -3 degrees F. It sounded good and the price was less than the other 3 mufflers like $100 dollars less. Not knocking the others, I almost went with the Bassani.
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post #6 of 39 Old 02-19-2015, 10:59 PM Thread Starter
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Based on the replies, it sounds like the stock air intake is ultimately the bottleneck. So changing just the pipe only changes the sound, not airflow. Thanks for all the replies! I'm going to go with the V&H.

If I feel the need to add power I'll go with the dealer flash upgrade and upgraded air intake.
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post #7 of 39 Old 02-20-2015, 11:01 AM
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Based on the replies, it sounds like the stock air intake is ultimately the bottleneck.
I most definitely agree with your assessment, here is what I wrote in another thread, " [i purchased] the vance and hines VO2 air filter in December which made all the difference! Especially over that garbage stage 1 screaming eagle filter I had gotten along with the "download" Speaking of which, to any other members reading this please don't make mistake guys, take my word for it and save yourself the time and money and just get a non-HD-aftermarket high air flow filter like the V&H, the difference is night and day. I regret not taking before and after video footage but I simply did not predict that the new air filter would have the all encompassing impact on my ride as it did (engine breathing better an louder, louder and smoother exhaust note, shifting-gears feels smoother and not as "clunky", better engine response, smoother acceleration [especially in the low end]). I honestly only initially got it because I liked the aesthetics of it over the "black box" that comes with the 750s....when I even talked to the dealship about how my latest purchase would affect my warranty they tried to tell me that the difference in performance over their stage 1 SE filter would be minimal if anything...oh how utterly full of **** those people can be!"

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post #8 of 39 Old 02-20-2015, 11:17 AM Thread Starter
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Can the bike be left out in the rain with the V&H air intake kit? I park it at a train station for the day. In Austin, it can be a 0% chance of rain, and flash flood an hour later.
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post #9 of 39 Old 02-20-2015, 12:56 PM
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I most definitely agree with your assessment, here is what I wrote in another thread, " [i purchased] the vance and hines VO2 air filter in December which made all the difference! Especially over that garbage stage 1 screaming eagle filter I had gotten along with the "download" Speaking of which, to any other members reading this please don't make mistake guys, take my word for it and save yourself the time and money and just get a non-HD-aftermarket high air flow filter like the V&H, the difference is night and day. I regret not taking before and after video footage but I simply did not predict that the new air filter would have the all encompassing impact on my ride as it did (engine breathing better an louder, louder and smoother exhaust note, shifting-gears feels smoother and not as "clunky", better engine response, smoother acceleration [especially in the low end]). I honestly only initially got it because I liked the aesthetics of it over the "black box" that comes with the 750s....when I even talked to the dealship about how my latest purchase would affect my warranty they tried to tell me that the difference over their stage 1 SE filter would be minimal if anything...oh how utterly full of **** those people can be!"
Did you reflash the bike after you put on the V&H breather? I am planning on adding the V&H breather and having the dealer do the stage 1 download.
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post #10 of 39 Old 02-20-2015, 02:50 PM
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Did you reflash the bike after you put on the V&H breather?
No because my understanding is that the ECM download through the dealership is a preprogrammed set of parameters. So it would be a waste of money to get "reflashed." Besides even the dealership told me that the ECM download should be just fine with the VnH air filter, and that if it was not that the exhaust would "make extra popping noises." (Rather vague I know, but that is all they could tell me).

Anyways I have 900 miles booked in with the VnH air filter and I have not noticed nor had any issues this far, very happy with the purchase.

Your ride will surely show you how thankful it is you got rid of that silly black box and got a real air filter! ;-)
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