I'm using oval tube from headers to muffs on my Nova. Doesn't give a huge amount extra but might be just enough for you to get 3" all the way. My headers fit very tight under the car and don't hang down... but they are custom Lemons.
Most say you lose very little dropping to 2.5" and it can actually boost torque?
Jeff-
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You remind me of the timing on a turbo engine...
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