I completed my Stage 1 upgrade recently. At first, I didn't notice much of an improvement, but with time I do. Guess there is a learning curve for the bike's computer.

My 2011 1200C now has 3" Cobra slip-on with 1.75" quiet baffles, the HD Screaming Eagle air filter and XiEDs from DK Customs. After a couple hundred miles I have slightly improved gas mileage (at least it is not worse), bike seems to run smoother overall and the oil temperature stays around 200 degrees F. That is an approx 15-20 degree reduction pre Xieds.

I'm pleased and so is my Sporty!

 

3" Cobras, DK 587 a/c here...installed Vieds a couple weeks ago. Had them on a few different settings and think I've found 75% to be the sweet spot. Bike is running cooler and much smoother. So far, it's been money well-invested.

 

Agree with money well-invested.

The more I ride it, the more I like it. Did a 200+ mile club ride yesterday and the bike ran well with the Stage 1. Improved gas mileage, less heat and even got a compliment on the sound of the Cobtras.