i am thinking of getting a 60size h9 p-51 and would like to know of any problems you all have ran into with it.i have their corsair and know it has issues like gear and firewall problems.does the p51 have the same problems?thanks

Yep it needs all the same mods done to it. Needs air retracts, bulkhead expoyed and glassed, and a few small other things.
Do a search and you'll find TONS of info
Good luck

The retracts are a joke. I used Frank Tiano Enterprises mechanicals http://www.franktiano.com , much better than stock and cheaper than air and no where near as complicated.

Also the keleo header is very cool, http://www.keleo-creations.com