If you already have a full litespeed then i'd just stick with that. Your gonna spend extra dollars for something that may be only a couple whp apart on the dyno.
Since this is only wanted for whp gain, your results may vary due to climate/conditions/humidity from others and for yourself.
I'd save the extra cash for other N/A mods, your nitrous kit, extra nitrous accessories needed, drivetrain upgrade (if you haven't done so yet) and future labor cost. Just my opinion though. You'll be stuck with a litespeed ypipe that will be hard to sell and will be low balled on.
