Peter,<BR>Well, I wouldn't go that far. The Ohlin's stuff is a bit overkill for most of the driving style(esp when you have that back problem..). Ohlin is quite famous even among the Japanese market, found them on one of my Japanese car magazines.<BR>ECU will not VOID all the warranty per say. If you run into problems with your car, and the volvo tech determines FOR SURE that the ECU is the cause for your problem. They will charge for the labor...that happened to me before. Long story, but the dealer shouldn't take the blame for what they did, though.<BR>In another word, if they know you have any aftermarket stuff they will try to screw u for good. It's just another way to safeguard themselves from those who don't know what they are doing to their cars..<BR>Just by upgrading the downpipe itself will not give you a day and night difference. You will eliminate some turbo lag, but with a better catback system and ECU...you should be very happy then. Of course this will not be as fast as a chip'd S4 with full exhaust upgrade, but good enough.<BR>A lot of people are happy with SuperSprint's system. They are not too pricey. But if you know a good shop that can do mandrel bend, you can probably save about $150~200 by doing a custom system.<P>Now...I NEED HELP on the BRAX~!~! <IMG SRC="http://www.swedespeed.com/ubb/biggrin.gif"> Let me know when you get your system in there.<P>