My 82 SC RoW is 204hp stock; maybe 220hp w/SSI's & Dansk 2 in/2 out?

 

I ran a few tests. My 79SC dynoed 189HP and 190HP at the wheels on two runs. I'm running SSI's with a dual out Dansk Muffler.

Independently I used a GtechPro and ran an average 6.7 second 0-60 time over three or so runs. Coincidentally my CV joint went out a week later. Can't help but think the hard starts contributed. On the other hand it could have been the 200k+ miles on the car.

 

I have Dyno'd my 1980 911SC 3 times with various mods. When the engine was all stock internally but had headers, dual in/dual out muffler and Webers it made 207 hp at the wheels. With a little port work on the heads and intake plus 964 cams it now makes 247 hp at the wheels, which is about 285 at the crank.
I had the same experience as Autobonrun, I used a G-Tech to check 0-60 mph runs (5.5 seconds) and busted first gear. The tranny didn't have many miles on it because I had replaced it 2 years earlier for, you guessed it, launching hard at an auto-x event. I have busted 3 transmissions now from hard launches so my advice is avoid 915 transmissions and if you do get stuck with one, get the car rolling then stomp on the gas.