I had a set of adj cam gears fitted to my gtr when I had the waterpump + timing belt done. The standard gears had to come off to replace the seals so didnt cost any extra to have these adj gears fitted.
A few years ago I had the exhaust gear changed on my gts-t and it cost me $200 fitted & tuned and was the best money I ever spent on the car (closely followed by the front/dump pipe).
$300-500 in dyno time is absolute BS. Go to a tuning shop that knows RB's and they will get the settings 90% accurate before the dyno is started just from previous experience.
PS - My flywheel wasnt machined, just had a small crack in it and along with a high clamping force single plate clutch and over 30x 8000rpm clutch dumps was enough to shatter it so machining would have made it even weaker.
As has been already noted above machining the standard flywheel can lead to serious issues. For that piece of mind buy an aftermarket lightened flywheel from japan it's really not fun side stepping a clutch at 8000rpm and having chunks of metal fly around the cabin.
That gtr is still in the garage being repaired, my other gtr ive never dumped the clutch and havent revved it over 6000rpm and it certainly will never be seeing any kind of track regardless of what clutch/flywheel it has - 1 broken gtr is enough for me I dont want 2.
This is how close it came to removing my feet:
The storm sounded bad from Penrith as it rumbled through and was black looking towards the city but we didnt get a drop of rain, lucky coz our driveway is more full of cars than a carpark.
I let my work van idle for 5hrs last weekend, jump started it then went inside to watch the final round of the v8's then went out after to do some shopping and realised it was still idling away in the backyard, ahh toyota's - love em!
stupid nrma battery is still dead tho.
I went today from 5-10pm and to be honest it wasnt the most exciting nite of racing.
Plenty of waiting around from cars running into the sand or sliding on their roof etc I think I spent more time in the pits than sitting watching.
I'm confident that next weekends SuperNats will be 10x better.
I don't know the exact cost no however it is definitely under $1k to fit dumps+fronts. The reason it cost you so much is because you had your turbo's changed also which is labour intensive (8+ hrs which is still well under $1k).
Doesn't cost $1k to fit dump+fronts, my exhaust bloke has fitted xforce dumps to numerous gtr's from underneath with the turbo's still on the car. Yes it's a bitch but it can be done.