I have a 03 f150 with a 5.4 with true duals with 40series flowmasters. Any out there running this set up without cats and o2 sims? Any affect on performance. All help is greatly apprectiated!

 

i have a 97 F150 true duels no cats with dyno max super turbos. and rear o2 sims from Rpmoutlet. it seems to run better with no cats and the only code on my CEL is EGR inseffisent flow. nothing with the o2's. i like it alot better than cats cant really tell you bout the better gas mileage thoe as im still revin it to sound it off to people lol. it has a lil bit more power and it smells alot better!