Our   Stage 1- 600 HP custom tune is rated at 600HP on 93 0ctane gas.  For the spirited client we also offer race gas custom tuning upon request.  We do not use any over the counter  pre made tuning files. We strongly suggest our high flow X-design exhaust . Our X-design exhausts are made in the USA  with quality stainless steel as well as exhaust flanges are made from 303 SS. The mufflers are also rolled from scratch and we use patent pending muffler components with louvered or perforated inner cores. We do not use any cheap overseas muffler components and we even send production pics to clients to observe the process.  By choosing the multiple tuning option, we can supply multiple tuning maps via our hand held smart tune flasher. It only takes a few minutes to swap programs without need of WiFi and or laptops like  other tuning options on the market.  For all your custom tuning needs please contact us at 773-980-6550 and speak to Markski directly. We guarantee our tuning for 1 month and back it up with a full refund if not satisfied 100 %.