if there are no tunes for the bbk, should i retrun if for a different programmer or can i select one of the other cai tunes. The codes that appear are lean bank 1 and lean bank 2. Thanx alot for your support

2008 mustang 4.0 can u run 93 octane gas on the 91 setting. when i install it the check engine light comes on. also i installed a bbk cai kit but the u7145 has no tune for bbk cai. which tune should i install