I have a 2005 Subaru Legacy gt that Has gtx30 and supported mods. I am running speed density. I had level ten from jersey rebuild it and after they rebuilt it was slipping again. So I had to drive all the way from Vermont back to jersey to have them look at it. I get there and they test drove it for like 4 hours and tell me they will take care of it under warranty. I thought everything was going to be fine and then a few days later I get call saying its slipping because I am running speed density and not maf. I called my tuner up he said there should be no problem running speed density and he also talked to Cobb. I go back down a few weeks later and they tell me I have to pay 3,200 dollars on top of what I already paid them which was 4,200. They said they wouldn't cover u set warranty because it's not there fault. It's my fault for running speed density. I am going to be taking my car to ipt. But before I do I want to know if anybody els is running speed density on a 5eat and if they had same problem.