its amazing how much you can do just with a little bit of basic machine work, that most decent shops can pull off, will do to a motor of that size..... mild porting and a better carb alone would make her a little more happy, if your budget is large enough you could even go for custom pistons to bump up compression a little and a custom cam grind..... but you definately wont find any off the shelf products that'll accomplish that for you.... a turbo definately would be an inexpensive way to add quite a bit of power as well.....