Collaborative early a experiment

The manafolds are the same between the 180 hp motors & the hi-po 235 273's. its from there back is where its alk diffrent. Slightly,better flowing Y-pipe & 2 1/2 from Y-pipe to muffler then 2 1/4 from muffler to the resonator. Id love to do it,but chrysler really did there home work developing the exhaust for the hi-po 273's! It sounds great & for the smaller motors it flows just fine. it i was gonna do bigger motor (more power) id be more than happy be a lab rat but for what it is it works great now.