I have a used A4 Quattro 3L from 2003. I believe its a B6, sorry if it's not. Under 90,000 miles on it, too. I've been searching google for things that I could do to it, but all I see are things for the 1.8T. What can I do or have done to it? Thanks guys.

Random pic of my baby.
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i think you can do an s4 exhaust but dont quote me, mine are the 1.8t and 2.0t haha. there really arent nearly as many mods out there for the 3.0, but the suspension should all be the same, and im going to guess you could find a good sounding exhaust for it and maybe a few carbon fiber bits to lighten it up and have it be pretty quick

 

you can supercharge it. . .

 

I bought my daughter a 2003 A4 3.0 MT6 and it has been a very reliable vehicle. Performance is decent, but there is really nothing you can do for a reasonable cost to improve it. It pulls very consistently without the turbo surge, which is one reason I bought it for her over the 1.8T. Noting that you are ~90k, make sure you have the timing belt and related components replaced -- it is due. That will set you back $1000-1200. Otherwise drive it and enjoy it.

 

you can sell it.. and get a 1.8t

 

a sprint booster is amazing on this car, a set of springs and shocks, slotted brakes and grippy pads, h&r bars with the service free teflon bushings , continental dw summer tires , k&n panel air filter. not going to wow the world but this will really make this car a joy to drive.