well thats a good bring up,cause most after market headers,have the O2 end of downpipe from the ones i have seen waste alot more gas if it is located there i cut and rewelded a New O2 sensor hole in my manifold and it gives a semi big diff.and less gas wasting so it does make a diff where the O2 sensor is if your running one
__________________
i love AUTOZONE
MY CAR iS PROTECTED BY ZOOMBAK GPS LOCATOR IS YOURS?
175+served in engines built from minime to gsr/lsvtec,b16 b20vtec,d15 k24 powerhouses or just rebuilds.life is good
i like when people don't take my advice.cause then i make more money when u need it rebuild the right way!
how many speed holes do i need in my bumper,b4 i can run 15's?