I have one in a HW98. Fitted it the same time as a tbt extension / kit in another. The custom seal took a little time to settle/wear in but has been fine since. Hard to tell the difference now.
Thanks for the reply
Would you say it maybe needed resizing a tad?
I’m assuming that’s what you mean perhaps a tad too tight at the start until it worn in.
Was there much power difference from when you first fitted it to what it is now?