The Thorley headers comes with a Y-pipe. They replace everything from the block back to the triangular flange before the cat. $950 shipped for the Thorley headers, $125 to replace the stock muffler, $400 for an SCT Xcal 3 with custom tunes and mod the intake if you please.

I think the Banks powerpack minus the ottomind is $2300 for parts only.

Another headers alternative is the Hedman headers and Y-pipe which are quite a bit cheaper than the Thorleys. I havn't heard anything on the Hedmans though. Someone here bought Hedmans for his V10 a few months ago but I havn't heard an update.