^^^^ + 50, each time a custom turbo kit car comes in 50% of the time they have the HD couplers, they rip, strech, tear, and are not oil/fuel friendly. Each time the car had massive boost leaks at each coupler.. they are not ment to see heat and extreme pressure, to each his own. but I have yet to see a HD coupler not leak boost, even a little (.5PSI!!), but for that have to get to work fix, it they work