Ramitiner
U.S. ARMY VETERAN
Honestly in my opinion it gained a bunch of torque on the bottem end compared to the stock log manifolds.I wouldn't worry to much about either size headers,they'll both blow the stock manifolds into the weeds as far as grunt goes. Way back when my truck was a little closer to stock,i was running a Diablo 93 canned tune and the stock manifolds,the truck was running low 14's with a best of a 14.19,threw the big JBA's /catless midpipe on it and had a custom datalog tune done,the truck went from low 14's to mid 13's with a best of a 13.4,admittedly the tune did help,but the headers were also a lot of the gain.That was with the stock cam and just a CAI and Magnaflow catback behind the catless mid pipe.
beautiful. thank you