Then you are certainly taking the right path....as I did misunderstand your post. Good for you... Again, I would think we would see the forum lit up if there were failures out there. I have not heard of any for sometime. I am running the 62mm on blue, and staying with the 65mm on the roadster. Both car run very well right now. We will have them both at the track next spring for some times. Both are modded the same except for the 62mm requires more fuel, so the fuel is different. Other than that, they are identical. Just missed the 11 second barrier by a few tenths last time the roadster ran. So, hoping to put them both in the 11's on street tires next spring...we shall see.