Many thanks for the help confirming the correct 2.25 inch stock exhaust pipe size. Had I kept the incorrect 2.50 inch mufflers the installation would have been a disaster.
I did not modify the mid pipe, but did install mufflers only today, and new tips.
Wow it sounds good! Not raspy like so many systems out there, nice and deep, definitely close enough to pass for V8 sound in most anybody's book, unless a total motorhead geek like most of us are, LOL, but would definitely fool 98% of most any crowd.
Magnaflow Competition Mufflers part number 14415 that are 14 inch round body, 2.25 in and out, along with with Different Trend 24113c Polished Stainless 4 inch double wall slant beveled cut tips that just could not look any better.
I could not be happier with how looks, how it sounds, and how it all turned out!
Thanks to all who pitched in with great info, many thanks!