Like snoopy said, Kteller. Full stainless system 2.5" all the way through. You can add an 18 or 22" resonator and it will be stock-like quiet at idle and scream at WOT.

Spoon header won't get you there. Best off the shelf header is a TODA period as shown in numerous dyno comparisons with other headers. If you have the cash and patience to wait to go custom, that would be even better.