This is a warning to those who are looking at HTT for a new turbo. I purchased a HTBG last year with the intention of an upgrade when my fueling (and funds) allowed it. I was told as recently as july that my HTBG (57/12) could be upped to a HTB2 a (62/14) for a fee of around $500. I purchased the HTBG under that promise only to find that last week when I called to have this done I was told it would cost over $1100 !!! more than double!#@$%! I asked why and they said its a big job and then spent most of the time trying to sell me a stainless 13cm housing. I would have just bought a 62/14 last year if I knew I would get screwed on the HTBG! Now I have to buy a totally different turbo and sell this one (probably at a loss). It still says the HTBG is upgradeable on the web site!!! Too bad, the HTBG is a great turbo for a mild truck, but I'll never buy another from HTT! I dont care how good they are.