My opinion fwiw. We are removing a twisted kit on a 13 cat right now and replacing it with a speedwerx supercharger. The "kits" are more of a one off design, and are pretty cobbled together. The customer tried making this sled work for two years without success. I also have a 12 boondocker cat, which is for sale BTW. It had about 3200 miles, 1800 boosted. The kit install nicely, and I have never had any troubles with it, other than a brown compressor wheel when brand new, which they overnighted me at no charge. The boondockers don't make the most power of all, but I think they are the nicest design and most reliable, and probably sell double of all other companies.