Ben Burrage
OBS Enthusiast
What is the OD of the pipe on those? When my Tahoe had the 305 in it, it had BBK shorties and Magnaflow (Bosal are the same) cats for a 5.7 2500 Suburban with the 2.75" pipes. Dual 3" in, single 4" out muffler. Re-used the same cats and rear pipes with Edelbrock headers and upper headpipes that welded to the front of the cats for an 8.1 Avalanche or Suburban when I 8.1 swapped it.
Appear to be 2.75. Flows great