If you aren't thinkign of installing the CNG kit in i the future than go for the non turbo,but if you think so than leave it,as one of the Mini owner had hared his expereince that CNG should be installed in a Turbo Mini as it boosts the Engine power so if there is no Turbo installed in it and than youw ant to run it on CNG than the pickup will be gone,that is as per one of the Mini owner had shred it up there in some of the post i had read all the complete thread,its not my personaly expereince so this information can be unauthenticated!!!but just wanted to share my knowledge.