Turbo back exhaust, better wider tyres, full service, suspension, brakes, etc. Lots of things you can do to improve your car before changing the turbo.
Also with sports, (depending on the sport) constant direction changing movements are better than running at a constant rate IMO. I'm too lazy/unco to do either, so I just lift whatever I can (light weights).
+1 well said. No health issues can be treated with burgers and chips.
I tried the whole 'eat every two hours' stuff (usually a green apple or something like that). Made no difference. Only difference was kJ in < kJ out. Eat less crap, work out more.