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go with the 40!!!i just put mine on... it sounds awesome... but cut off one of the cats for sure... i used to have the same muffler on before andf it was not as loud... it sounds great now tho
I have a 400 with true dual 2" exaust till the tranny crossmember then it goes to 2.25" and thrush magnums dumped in front of the rear wheels (no front tank)
I have to say that it does not sound like crap, it ain't unbearably loud but really powerful sounding, and it has the power to back it up. I do recoment the flowtech purple hornies over the thrush though, I just used what i had. If i can I'll post a clip on exaust sound clips.com Oh and louvered glasspacks are the old musclecar sound. Those or the chambered mufflers that summit sells.