RE: Does exhaust diverter decrease power??
Those exhaust deflectors need to be fitted properly or else the airstream tends to bend them back and they restrict the exhaust outlet. Thats when the power is robbed.
That said, I rarely use on e because any increase in length of the outlet is a restriction and that can be measured in meaning rpm loss.
Its less of an issue with more powerful engine but with the little .061 and smaller its noticable