Harley Davidson Canada is offering to include the upgrade as part on my extended warranty, so I going for it. I purchased the bike new in April 2018, and the bike currently has 16000km (10000 miles) with a stage II torque kit and just feel the need for more grunt. They pick up the bike on Wednesday to do the install, recall and have it ready for the spring.
Can't wait for Spring too get here...

 

Stage IV won't have more "grunt" unless you spin the engine up above 4500 RPM. Stage IV is all about horsepower, not torque. It'll make the bike quicker in high-RPM operation.

For low end grunt, your Stage II Torque Package delivers a lot more than Stage IV does. You might want to check the Harley HP/torque charts to make sure you understand how different the bike is likely to ride after the change from II to IV to make sure you'll be happy with the changes. A Stage IV will run away from a Stage II at the dragstrip, but a Stage II Torque will probably walk away from a Stage IV in a top-gear roll-on contest.

 

Good luck!

 

 

I think I've looked at the Pro's and Con's however, with HD Canada adding this upgrade to my extended warranty I'm good until 2024. Keeping my fingers crossed that I get a great kit....

 

I think you'll love it. I went with all HD SE stuff because I didn't want to have to worry about warranty. My motor had to be rebuilt at 1800 miles... I've beat the **** out of it ever since and it's not given me any more problems.... And everyone is always talking about aftermarket is so much faster.. My buddy has a FM 120" kit.... He barely pulls me.. You'll be happy with the bike but not the dyno sheet.