Hey Guys need your Opinions Please.

Ive just fitted a set of Vance & Hines Black Widow Slip ons to the wifes 09 Nightrod Special.

The air filter is stock. The exhaust note is beautiful.

I know the bike is set to run lean but ts running perfect, no popping on decel, no pinging ,not running hot.

Everything Ive read in most cases people are fitting different ECMs to tune and say to not do anything is risky.Do I need to add an autotuner.

Can i be doing any harm to the motor without knowing.

Thanks for any comments