I have a vance and hines big shots full exhaust no a/c or programmer.
My question im about to add a air cleaner kit do I need to get a tuner. Ive been told no and yes also been told running a exhaust with no tuners will scar up my heads and guts in engine. It is on a 2009 fatbob and my buds street bob has an exhaust and and a/c but no tuner and it runs fine. Can some one shed some light on this for me.
Thanks

 

Once you add air cleaner and exhaust, you need to add some sort of fuel enrichment. The air cleaner and exhaust both will make your bike run very lean, so you need to add fuel.

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