T'was my understanding that most US Viggens were about 212-214 whp. That's what EVS told me before I made the dyno run, which is almost scary come to think of it since I ran exctly 213! It probably would have hit or passed the 214 mark had I gotten a few more runs, it kept getting stronger each time by several horsepower.
I think this power is pretty standard for the car. I didn't do anything exceptional. I did have my friend thoroughly spray down the IC and Rad to keep temps down as the fan they used to cool the car was questionably effective. The fan was just too high off the ground to get any real airflow over the intercooler. Other than that, nothing significant. You know I have that little cheesy air filter on it, but I doubt that made any real difference in performance. On the other hand ... it made it sound AWESOME in the dyno room.
I was the one driving the car on the dyno, but my friend who was spraying down the IC said it he couldn't even hear the exhaust over the jet-engine sound of the airfilter. Unfortunately, even more amazing is how much closing the hood muffles that sound.
Really can't see how it could be modified. It only runs the factory stock ~15 psi, and all the mechanical componants look stock. Perhaps they really did bump up the power in 2002 on the Viggen when it was bumped up on the 9-5 Aero? Might explain it.
I'll get back to you if I find anything. I was even using the stock PFR6-H10 plugs! As a matter of fact, tomorrow it's getting it's 30K service, so it did that dyno run on 10K old oil. Seems to have survived in one piece, but I wish I could have done it AFTER the service. (I didn't get much choice, it was a holiday present from my friend who went with me. ) Fresh oil bath might have been worth a hp or two.
Cheers,
Dubbya