First, know that to make more horsepower, you need to rev higher and enable your engine to be effecient at that level. Then you need to realize that torque kills drivetrains and RPM kills engines. 15whp brought me from 16.3 to 15.48, so another 10whp and I'll definitely be in the 14s. 140-150whp will be enough to bring a P5 into the 14s I would believe. And if you go with forged internals and 11 or 12:1 compression, larger cams and a stand-alone, you'll be much more than 150whp. There are some limitations as to what Tri-Point was able to do with the FS, but with enough money the sky's the limit. And that's just it. How much power you make has to do with how much money you want to spend. The only thing that's cost any serious amount of money on my car has been my exhaust and cam gears. Advanced ignition timing, my 'exhintake' cam and the RX7 AFM were next to nothing, but obviously you guys don't have those options.
Most people who do FI just have someone else install and tune it. All of us serious NA guys are doing all the planning, building and tuning ourselves, which is extremely satisfying. I've torn down my spare engine with my bare hands, and am going to blueprint it and build it back up again. Not to say FI guys can't do the same, but with NA you have to squeeze every little ounce of power you can out of it, so things like lightened and balanced crankshafts, and headwork are less common since it's so much easier to just find ways of turning up the boost.
