Sup every one i have a quick question im looking for an exhaust, I'd prefer a D&D cause its loud, but i have a califorina cbrf4i that has a o2 sensor all the exhaust i look at dont have a spot for it will it mess up my bike if i purchase an exhaust with out it?

 

you will need to purchase an O2 sensor eliminator. Or purchase an exhaust for the 2006 F4i. All the 06's (and maybe earlier since 04) have an O2 sensor. My 2 bros exhaust came with a bung for the sensor in the midpipe.

The O2 sensor eliminator will hurt your gas mileage a little, but you will notice your bike accelerate a little smoother

 

i just bought an o2 eliminator from 58cyclestore.com for 18$....works great. but don't ride without one