Demon exhaust on a 4 doors Dart?

the 3'' inch extension may fix the difference in length but the manifold flange i bet is different. i know that tti needed to know exactly what p/n i had on my manifolds to get it right. they said the driver side had a ball type flange on it and there were differences in the way they conected. i don't know about dynomax systems but i would suspect the same rules apply. maybe you can call dynomax and get their advice.....