also , if you want mines speed and driveability (there white r34) you better change you driveline , depending on what model gtr you have.
there diff ratio's are vastly different from a standard r34 which is why if you watch there video's the tacho's is spinning so hard , at tsukuba the mines gtr is going through two very tight hairpins in third gear! which we were doing in 2nd gear and we have shorter ratio's than standard at 4.3 (gts 4 diffs in our r32)
the m speed gtr was the same, top speed was 250 in sixth with a hollinger!
dont get me wrong it's a bloody fast car, but there are plenty of tricks to make it do what it does on those tracks, it would run out of revs about half way down the straightr at eartern creek or queensland raceway.
also read the big red warning on the warranty for the engine , oil surge in a gtr engine is almosty a given if you are seeing enough traction & there is no warranty when you spin a bearing!!
there are quite a few gtr specialists in australia that can build you an engine that will amaze you , and it will be built for our conditions!