2 1/2" pipes are absolutely the largest I would consider. I've tried 2" and 2 1/4" and both work well on a 289 or 302. 2 1/2" pipes will kill low end torque, and unless your revving past 6k, I don't think you'll find any benifit to them. My car runs pretty good with the 2" on there right now, but I'll probably go with 2 1/4.
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