I have thrown plenty of blatently modified turbos out of work stock before. I have also thrown out HX50's in Hx35 exhaust housings, people with S300's that swore Industrial Injection sold them their 66mm s300 as a direct replacment for a stock turbo and it was just like the HX35 they took off. I even once threw out a Mack covered S400 that Scheid built for a workstock truck and stuck an HX35 data tag on it with glue to claim that is what it was. Sledpuller was there. The look of shock on Dan Scheids face when theye were busted was priceless. By the same coin the same turbo on the same truck had won plenty of pulls that year in that class with other organizations, including of course the Scheid Diesel Extravaganza. But it didn't fly with me, so yes regardless of what the rules are if you don't have good techs there is no telling what is going on.