I do get a 0336 code once in a while. It doesn't hurt a thing and it doesn't bother me. I wouldn't change a thing on my tst box. It does what I want it to do. A pressure box does compliment the tst box. I can make the same hp with less smoke and lower egts with a VA3. 1 set on 50% and the duration turned back on the tst. I found out the tst on level 4/4 would slip the stock transmission. level 3/3 is about all the stock transmission can take.