Before you get offended from what I am going to say, I'm not trying to put out a bad review to PCM4LESS, and there are many threads on here praising them, in which people have LOVED their tuned PCM's.
I just recently installed my tuned PCM from them and wasn't too impressed...
I've been considering a PCM tune. I've been reading through all the info I could find, but haven't seen a thread that mentions if there are any risks involved. I'll probably get it done anyway, but I would like to know what I'm getting into.