I'll be the first to say that rhhp from a dynapack for sure is way higher than the fwhp meassured on any dyno. I have a German friend with 998 WHP from a Dynojet, and my car is substantially faster on my pump fuel map (1100 rhhp Dynapack).
I also know several Danish Supras in the region of 950-10xx fwhp, and they are no comparison.
Also, the other day I did 100-150 mph in 3.29 sec. on pump fuel. That puts me in 5th place on the 6spdonline list:
100-150 times:
2.77 - HoustonT, UGR TTG, 1550 rwhp
2.92 - UGR Nera TT Gallardo / 1550 rwhp
3.10 - AMS Alpha-12 GT-R, 1309 whp
3.24 - Divexxtreme, Switzer R1KX GT-R, 1248 whp
3.71 - Switzer R1K GT-R, 1030 whp
3.81 - 1swtride / C6 Z06 / built 427, YSI blower, 1080rwhp, auto
3.82 - joetwint, Evoms 996TT, 1,000 whp
3.90 - KPG, EVOMS 996TT E85, 900whp
4.41 - Corvette Z06 TT by AVK Servis
4.43 - jbsteven, Ford GT TT/SC
4.48 - Divexxtreme, Protomotive 996TT, 900 whp
4.68 - TwinTurboM3, E46 M3 TT
5.55 - 997TT with A30s
5.89 - Mbailey, 996TT
..Etc..
And yes my data's are dead on. V160 gearing, rear end gearing, Tire profile (calc here: http://www.hjulspin.dk/regnemaskine.htm ), and then compared to RPM and time in the Motec logfile. Should be more precise than any GPS box. Slope was less than 1% (from Google Earth).
As you can see that puts me in between Switzer R1KX GT-R 1249 whp, and Switzer R1K GT-R 1030 whp. That wouldn't be possible with 1100 crank hp.