A table i have found for the hart inlet.

Std TB + Hart then RS500 TB + Hart

4000, 278lb/ft 215bhp - 280lb/ft 230bhp
4500, 325 & 276 - 331 & 291
5000, 350 & 331 - 360 & 334
5500, 347 & 364 - 365 & 377
6000, 340 & 388 - 356 & 407
6500, 335 & 411 - 352 & 435

Figures from a engine dyno

Steve