After 13-years of pokin' along behind my 150 HP powerplant, I'm starting to explore what's available for having my existing engine modified for more HP...  Already tried a LSE electronic ignition replacement for one of my mags which worked great - for about 30 minutes at a time (seemed to be a temperature related intermittent condition so am back to the ol' reliable set of magnetos).  Maybe high-compression pistons?  Fuel injection?  Is there an engine shop out there that specializes in souping-up little engines someone an recommend?

 

Lycoming O-320-E2D 150 HP