So I have an 02 OX66 150 on my bay boat and was wondering what the difference in it and a 200 were. I've been comparing part numbers and going through manuals and all I can find are different part number for the CDI box and the cylinder heads. Also the 150 runs a BR7 plug and the 200 runs a BR8. I know the BR8 is a cooler plug that usually means there's more compression there but from what I've seen the 125-130psi across the board on my 150 is right in line with most 200s. What are the actual differences in these motors? If it's simple plug and play and I could find the parts, 50 extra HP sounds nice. Thanks in advance for any help!