One of my other hobbies is messing around with old Saab cars, which you can still get pretty cheap. Yesterday, I got my 2004 9-5 ARC wagon on the lift at a friend's garage to investigate an exhaust problem and it turns out this is a good time to drop the sump and investigate possible sludge buildup on oil the pick up screen. Then the discussion turned to boosting HP by reprogramming the ECU and possibly going to a 3" downpipe and sport exhaust. The stock HP for the ARC I is 220 but I believe I can get it up to 275 by simply re-programming. My feeling is for now is leave the old 9-5 stock and see if I can get another 10 years out of it. However I've got an 1998 Turbo convertible that is much more fun to roar around with so its a more likely candidate for a ECU re-map. Stock HP is 185 and reportedly a stage 1 tune takes it up to 220 or so. The reported 0-60 time isn't really all that great by today's standards, but with the top down, running errands around town is way more fun.