hi iknow it sounds mad i have efi orion and s2 rst [mfi] but the s2 needs resto big style and my onrion is sat there with no engine but with resto done so im want to swap over for this season its a runnin car 200bhp so want to swap till i do the rs as it got good engine etc the question is can ivuse part loom or do i have to change the lot i now your gona say change to efi but this is more cost thanks