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I kinda figured you were running high grade fuel. I would be cautious moving the horsepower forward. Obviously stock boosted cars can undergo HP performance enhancement without worrying about the engine but the greater the power-to-weight ratio of the engine the more dangerous knock becomes.
I was pretty sure Saab would have anti-knock systems in place since they are more of a up-scale manufacturer, nothing against those that don't, mine doesn't. Combining the economical driving with the performance you will want to carefully watch engine temps and exhaust temps. Squeezing the block one way a little is fine, but then squeezing it the other way a little too you get into places that pre-ignition is more common. IF that happens because WAI eco and some grill shielding while performance driving Carmen will need a heart transplant in a hurry.
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