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That is a bit larger than I'd go. How much horsepower does this engine put out? What are the normal cruising rpms? What rpm range are you targeting to increase torque?
From the literature I have, a 1.5" primary is good for 26-38 hp per cylinder. 1.25" would be plenty (17-22 hp per cylinder) with a 1.5" collector outlet (which emphasizes low rpm torque).
Edit: I just checked the outlets on my 82 CM400, and outlets on the mufflers are only around 5/8" and that engine puts out roughly 43hp.
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