3" or 2.5" exhaust (pics)

I ran TTI 2.5" on my Six Pack Challenger with Walker Dynomax Super Hemi Turbos and ran [email protected]. Motor was built to pass the Certified Stock teardown (and did). Ran that @ 3960lbs and on repro PolyGlas tires. 3" wouldn't have made any difference on that car except to drop back pressure and make it sound like farting in the tub.