I don't know how much different the 2.7L is from my 2.5L I had butwhen I jumped to a 3.2L it didn't make much of a difference torque wise. I really noticed a difference at the mid all the way to top end of the RPM range.
Perhaps your 5-spd will match up with the 3.2L better than the 3.2L matches with the 996 6-spd........hmmmmmmmm.
I no longer seek extra ponies from my car since I've gotten my 3.2L.
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house