You will get a bit more HP & TQ from the Long Tube Headers than the Shorty ones. This assumes you also replace the OEM Catalytic Converters with new free flowing ones, X or H pipe and good mufflers (Borla, JBA, MAC, Magnaflow, Bassanni, etc). From what I have read....LTHs gain 12-15 RWHP/TQ and SHHs gain 8-10 RWHP/TQ. Every little bit helps!