2003-2004 Cobra Dual or Single Pass Heat Exchanger?

I have an AFCO single pass heat exchanger P/N: 80274N AFCO 80274N - AFCO Heat Exchangers – SummitRacing.com currently installed on my 2003 Cobra. In my garage I have a new in box AFCO dual pass heat exchanger P/N: 80275NDP AFCO 80275NDP - AFCO Heat Exchangers – SummitRacing.com. Would there be any real benefits to changing my single pass out to an identical sized dual pass heat exchanger or should I just Ebay it and put my money elsewhere? I live in NW Washington so summer high temps are low 80's. My 2003 mods include a 2.76 pulley, Stiegemier Stage IV port (running 14.5lbs boost), Accufab Throttle Body, C&L Big Tube, K&N Filter & a Steeda Short Throw.
Thanks, Mark