We had 2.5" pipes from the manifolds back to the muffler which was a Flowmaster
"Big Block Muffler" Dual in dual outs. If you look at the factory pipes, you
see they crush down a ton to go under the rear end not very efficient. Full
2.5" pipes from the manifolds back will improve gas mileage, sound and horse
power.
Only if we could find a good set of headers for the car probaly about 7-10 hp
there too and about the same for the biger pipes and flowmaster
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