Hello,<p>I am looking to buy a 850 LPT sedan or S70 GLT LPT. I will be new to Volvos, I would love to get a T5 or R sedan but they are pretty hard to come by here in the midwest on the used market. I have seen some people saying that you can upgrade the chip on the ECU of the low pressure turbo engines for increased performance. I would be wanting the car as a daily driver, but I am the type that likes a sleeper. I had been thinking about a wagon in case some of you saw me on the XC forums, but have decided to go back to a sedan. So.. My ? is, Can you reliably upgrade the low pressure motors in this way? How much will it effect fuel economy and reliability? Should I try to find a pre-ETS model (I have heard alot of nightmares on other forums) Sorry to be so windy, thanks.