Hi!

My TT PRO .40 SE had a ABN cylinder ten yeas ago! And so had all the TT PRO.40 Se we used in sport Q-500 pylon years ago.
Don't think TT has ever made a chrome cylinder for their engines......only ABN.
Does it really matter ....NO! As long as the engines work and does so for years and years ..who cares!

Regards!
Jan K
Sweden