I only know of a few people i can count on two hands how many turbo builds ive seen. I think the tuning issues come from not enough people going turbo and no one has much experience with them. A nice 750 rwhp challenger with an STS kit just came out of arrington. The 1400 awhp jeep in florida is totally custom. My friend big al has a custom build 426 TT that has been a lot of problems but has hit 9’s in 90* air temps. I havent seen anyone go eith the hellion kit at all yet.