The dynojet program figures the correction factors not us. We tuned Seb'd car on 2 different dynos with the stock ported manifolds and the JWT 530 turbos..... The highest HP# we could get with the stock ported manifolds was 470 RWHP. After tuning with the inconel manifolds and jwt 530 turbos we were able to get 523 RWHP and the whole curve is 50 to 60+ RWHP better as well as 50 to 60+ RW torque better. I do not think any of the conditions are going to bring these #s close. We also did lots of drag racing whith the stock ported manifolds and we will be doing lots more drag racing with the inconel manifolds in the near future. The MPH in the 1/4 mile will tell the truth as well ;)