the 3800KV should be alright. You can use the trex 450 se motor and that will work too. You should get a motor that meant for 450 size heli.
John
Nitro Planes
ORIGINAL: denway
purchased an exi450 LE from you, what motor is being used in this copter? the 3800kv and the 4200kv outrunner motors that i have, will not work in this copter as they are to wide. the inside dimension of the frame is 22mms and the motors are 28 mm in diameter....thanks for the help