Micksan
Supercharged
- Joined
- Nov 16, 2010
- Messages
- 448
- Location
- Del City Ok
- Ride
- 2023 Triumph R3 GT, 2022 Moto Guzzi V85TT,
I just got off the phone with the Bosh Tech rep. They have discontinued the +4 plugs. No reason given. Some are still in a few stores Their crossover to our stock plug would be the XR4CS which is their coldest plug. the XR5Cs would be one colder. The more I am looking into it the stronger my belief is that as we modified our bikes with the TORS, K&N, and Maps we changed the dynamics that were used to assign a spark plug. So with the changes that help our performance a lot of gas goes out the tail pipe.