What to tell the exhaust shop.

cchrishefish said

So my plan to run 2 inch pipes for the wye does make sense when it comes to performance. I think I will go with my original plan. From everything I have read Slants perform best with a single exhaust. So, I think this is how I will hace it done 2 inches for the WYE then increase to 2.5 all the way to the back. I am considering a Flowmaster 40 muffler. What other mufflers should I take into consideration, Thrush, Cherry bomb, Walker? The car is for street use so I do not want to wake up the dead.

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Pete Hagenbush, lead engineer on the Super Six, said he got excellent results with a 3-2-1 system. His interview on the subject is well documented at Allpar.
That is cylinders 1-2-3 joined together, 4-5-6 joined together, then both joined into a "Y", then into a larger single pipe to the rear. Like shown in post #11 above. Remember, there is only a single exhaust relief at the trans crossmember I always take weight into consideration when modding my car and something like dual 2-1/2" pipes on a slant just isn't needed. Dual pipes and dual mufflers are self defeating weight wise. And as the exhaust moves to the rear it is cooling, reducing in volume, so it requires less pipe diameter.
I like your original plan with a Dynomax Super Turbo. Good sound without sounding obnoxious like a Magnaflow Mustang or Corvette.