Connector pipes are 2.25". Pipes back to the transverse mounted muffler are 2.5" with a 2" crossover. Muffler is a Flowmaster, I think it's really just two mufflers in one case but not sure about that. 2.5" out of muffler then 2.25" resonators out back exiting under the outer corners of the bumper. Resonators are altered JCWhitney glasspacks opened up for full 2.125" inside diameter thru and shorted to about 10" long to fit the available space.
The big block configuration was 2.5" all the way from 3" header collectors to the front of the resonators. I never took it to the track but the intent was to remove the resonators at the track.
