Well, First off, according to the muffler manufacturers I know. I have been told that after the mufflers, it does not matter what size the tailpipes are (within reason obviously). RE: 3" tailpipes should be fine on a 3 1/2" system.
Second, I have been told to use the choosen size primary pipe and muffler, then size down to the tailpipe. I have been told it is to early to neck the system down before the muffler, so you may as well just use 3" all the way from the headers if you are not using 3 1/2 mufflers.
Last, 3" is probably OK for your system. I just finished a 758HP all aluminum 572 and used 3" on it, and it still did 600 to the tires which seems about the right amount of loss for this dyno.. My street racer is a 404CI and makes almost 950HP on the giggle. Puts 760HP to the tires on the same dyno, runs bottom 9s and I run 1 3/4 Primary's and and 3" to the tailpan
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Frank Serafine
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