Did you upgrade the clutch as well. 5000 rpm launches on the stock clutch and it will wear out pretty quick. I launch mine at about 3-4000, with a little bit of clutch slip. even at that rpm, too quick with the clutch and they spin.

Also CB99SVT has drag radials IIRC, so his launch will be completely different.

Simon new- '04 Dodge Dakota 4x4. V8, 5spd FOR SALE Black 98 SVT EO (#2119 of 6535)- SOLD! New project-'88 Ranger 302 swap.