i just got a new pipe today for my sled. it is supposed to the same pipe that is on it now. i got it installed and now it wont run right. i got to thinking that maybee i have an efi model. i'm not sure how to tell the difference. i am going to call the pipe company tomorrow to see if the pipe is the right one. but i would like to know hor to tell if my sled is an efi model or not.