[z4mnyc]

I had the SS v1 stepped headers & could not solve the primary o2 sensor miss-reading problem no matter what we did. I replaced these with euro headers from Turner and problem solved. On top of the o2 issue the v1 stepped headers did not fit the car properly. We even ordered a second set just to be sure and ended up modifying one set to fit. I think the fitment problem was fixed with v2 but not so sure about what changed with the o2 situation. I'm really happy with the euro headers and I will post dyno results here at some point for comparison. With the SS stepped headers it saw 300hp at the wheels. The car runs much smoother now that the o2s are reading correctly.