As the others have said, the advantages of power are had earlier along, not right at the end, if you want power increase the turbo put NOS in, 8500rpm aint going to gain you much if any at that high, and all it is going to do is wear things alot much alot quicker than normal operating levels, No gain in it, pointless thread.
On another note, why dont you check out the FI dyno results, and you may just see were the power is to be had with the extensive modifications list to go with it.
Cheers A