Yep, since you're running an X pipe, 2.5" tail pipes should not restrict flow at all with your engine. Definitely go mandrel bent though on the tail pipes. I'm running that exact setup(3" exhaust, X-pipe, 3" mufflers, 2.5" tail pipes) with my ZZ454. It's so much easier dealing with the 2.5" tail pipes in terms of fitment and suspension travel.
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Chris Robinson
1969 Camaro SS/RS, 489 ZL-1 MPFI, T-56 Mag
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