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2017 Street Glide 124" S&S Power Pack - Exhaust and Performance

2017 Street Glide 124" S&S Power Pack - Exhaust and Performance

2017 Street Glide - Get Lowered Cycles

True Duals, 2-into-1, long muffler, short muffler, baffle, no baffle - which pipe is best? We recently finished installing an S&S 124" Power Package on a 2017 Street Glide. When it arrived in the shop it was a stock 107" with an upgraded Arlen Ness Inverted Air Cleaner, and a set of Magnaflow Knockout mufflers and Magnaflow head pipe. Check out the initial Dyno numbers.

2017 Street Glide Dyno Chart - Get Lowered Cycles

Overall pretty good performance and smooth torque/hp curves. Now that we knew our baseline and the bike was running good with no major red flags it was time to get to work. Full day of motor tear down to follow.

2017 Street Glide 124" Power Package - Get Lowered Cycles

Once everything is apart, the first piece to go back in is the oil pump, 550 S&S cam and upgraded cam plate. Check out that blue gold!!

2017 Street Glide 124" Power Package - Get Lowered Cycles

2017 Street Glide Oil Pump Upgrade - Get Lowered Cycles

2017 Street Glide 124" Power Package Cam Plate - Get Lowered Cycles

2017 Street Glide 124" Power Package Cam Sprocket - Get Lowered Cycles

Next up - New gaskets, pistons/piston rings and those big barrel 124" cylinders.

2017 Street Glide 124" Power Package Piston Rings - Get Lowered Cycles

2017 Street Glide 124" Power Package Cylinder Install - Get Lowered Cycles

2017 Street Glide 124" Power Package Cylinders - Get Lowered Cycles

Since the motor will be putting out some serious power, the cylinder heads get upgraded valve springs and seals.2017 Street Glide 124" Power Package Valve Springs - Get Lowered Cycles

2017 Street Glide 124" Power Package Valve Spring Install - Get Lowered Cycles

Our customer also wanted to black out the motor so we installed black tappet and pushrod covers. 

2017 Street Glide 124" Power Package Tappet Cuffs - Get Lowered Cycles

2017 Street Glide 124" Power Package Black Pushrods - Get Lowered Cycles

Next up - air cleaner, exhaust and floor boards installed and can't forget about that clutch. We've used the AIM performance clutch and coil springs on other previous motor upgrades and have been happy with them. Gotta hold the power!

2017 Street Glide 124" Power Package - Get Lowered Cycles

AIM VP-SDR Performance Clutch and Springs for Harley

AIM VP-SDR Performance Clutch for Harley

AIM VP-SDR Performance Clutch for Harley - Get Lowered Cycles

Time to get this motor dialed in. After a few heat cycles, low rpm road time and initial tuning on the Dyno. Something wasn't quite right - the motor was having a hard time finding an even idle. Under acceleration it would stumble and drive ability was terrible. After hours of adjustments adding fuel, adjusting the tune, less fuel here, more fuel there - it was still a spitting farting mess. Check out the Dyno chart below to see just how crazy the tq and hp lines.Years ago S&S put out an excellent video explaining a similar situation to what was going on here. Check it out and notice the similarities. 

 It was clear the current exhaust system was not working for this new motor setup. The Magnaflow pipes were not working with the bigger displacement and cam setup. 

So we decided to up grade to Bassani's Road Rage 2-into-1 system with the matching Pseduo pipe for a balanced look. 

2017 Street Glide 124" Power Package with Bassani Road Raeg

2017 Street Glide with Bassani Rod Rage Exhaust System

Another tune session - and viola! Check out the difference. This chart is from the exact same motor, cam, air cleaner etc. ONLY thing different - the pipes. Crazy but true!!

Take away here - Run the system that will work best for your motor setup and always get it tuned! If you swap out your air cleaner or exhaust at home you can use products like the PowerVision or a FP3 from Vance & Hines set the correct air/fuel for the motor. Obviously if you do a motor upgrade you really want to make sure you take it somewhere that can install and properly tuned your setup. But never underestimate the difference a set of pipes can make on your bike!

15th Jul 2020

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