You don't have to do any changes to motorcycle when installing a slip-on. When reducing exhaust back pressure, you should consider what it does to the air/fuel mixture. Remapping is required if you want the most performance and smoothest power delivery from your bike.

Does a slip on require a tune?

Popping and lean-running issues: Generally speaking, a slip-on can be installed without needing a tune.

Do you have to tune your bike with slip-ons?

Our Softail, Dyna, Sportster, and Indian Scout slip-ons do not require tuning, but it is recommended for maximum performance gains. ... We do not manufacture a tuner, nor do we have any specific recommendations, but our systems are compatible with all major tuners on the market.