Mercury says the 2006 Bravo One drive is good for 400 HP,will it handle 450HP?

Yes it will, but as always it depends on the application and use. But I have seen others with much more power thru the B1. Just rememeber torque and heat will hurt a B1. So be easy on it when coming on plane and dont hammer the throttle at 2500rpm, wait till you get a few more revs.. and it should live a nice long life! Check and change the drive fluid at regular intervals..

Hope this helps
D*ck

There's always a huge debate here on this...all I can say,from experience,ABSOLUTELY!!!Others will say,from their own experiences, absolutely not.Guess it's like anything else,u get a good one or a bad one.I have 3 Bravo 1's pushed by 500hp's w/220 hrs.I also have 2 pushed by 525's w/260 hrs.All 5 drives have had no service except for regular fluid changes.Guess I'm lucky to get 5 good one's