looking to change out my plugs and im a bit confused on which NGK TR6s are. so on summit, the plugs that im looking at are"TRIUMPH TR6 NGK iridium IX BPR6EIX/6637" and "NGK V-power spark plugs TR6/4177". not sure which one is the TR6s everyone is talking about.
also, I have a 2.3 whipple at 15#
also, I have a 2.3 whipple at 15#