I had got a TST about a year and a half ago and it did make power but threw all sorts of codes.I was on the phone with Mark and his head guy a few times and tried moving grounds,tripple checked each connection, etc.,etc. I even took my truck down there and they looked at it for about 4 hours, They put on new wire harness, moved ground to different locations, and whatever else they tried. Nothing worked so Mark gave me my money back. But I see on their site now it says they have "most" code issues resolved. My truck is a S.O. 03 model. And I sure want to get one again. Anyone know if they work now without issues? I have a Edge juice/EZ stack now and have never thrown any codes, makes decent power but I want a little more.

 

I havent had one bit of trouble with mine, i love this thing!! Agressive power when u want it.

 

i have had mine kick a couple codes with the crank sensor and cam sensor and i bought it about a month or two ago
but i love the power time for a bigger turbo

 

It will throw a CPS code once every 6 months or so.....but thats about it.

 

I had some code issue's when I first installed mine, a new harness seemed to cure the problem. Sometimes if I don't have enough fuel pressure and I'm pushing the truck to the point where it jerks, I'll get a P348. But once its cleared it stays cleared. It seems you definetly need supporting mods for the TST to run well. Also my truck is an HO not an SO just FYI.