New guy here. Been reading up for a while. Had my 08/6sp dynoed yesterday. Car has fresh plugs, oil, and filter. Made 324 hp on all three pulls. Temp was 81* F. Dynojet dyno. A/f was a bit lean up top, but pulled all the way through to 8500. Will be doing the update to 231 today. Another dyno will be performed in a week or two. Great website with lots of technical info!
Edit: less then 12 hours later, car was updated successfully to 231E by Mike Benvo. Great guy, in and out in 30 minutes. Two thumbs up!
Thoughts: car feels great, seems to pull a bit harder, however the dyno will tell. Thanks again Mike! Enjoy your vacation and be safe.