Nice car, but that's a typical DTP dyno... no way in hell a '98 makes anything close to that. Even w/ LT headers and a LS6 intake a '98 w/ the older LS1 heads won't make more than 335ish rwhp. Later LS1 w/ the 241 heads will do 340s w/ full bolt-ons. Anything over that is ODS (optimistic dyno syndrom) of which DTP is known for having.

GLWS.