The 25 T1 is a 3 blade prop. I ran one on my 2006 Cougar in the hotter months and loved it. In the spring and fall, I ran the 27 T1. Both props were great, but when it was hot and humid and I had a full load the 25 got it out of the hole quicker. I have a worked and ported 27 T1 I always meant to run. I never did, and it’s just an expensive paper weight now that I have a Mercury. If you want to try it, let me know. You pay shipping, and if you like it, make me an offer for it.