well either way what you can do is play with the ECU. If you have a turbo great, but that kills the idea of adding one for HP gains, but it saves you some coin. If you get a programmable ECU you can set it to run your current HP(Maybe higher) and then you could set it to run lean-burn(injecting less fuel than it can burn). The really nice(expensive) ones allow you to switch on the fly.
With the Saab I don't know much about. . .I don't know anything about anything. . .how close your engine gets to knocking on a regular basis, but I would gamble it gets pretty close since its a low volume high output engine. It could cause problems, but I suspect your car is smart enough to relieve pressure if it detects pre-ignition or intense knock.
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