COOKIE MONSTER

iTrader: (5)

This is weird... My buddies and I have just installed my lt headers, and x pipe on an EGR car. We ripped out the EGR an the rear O2 sensors. THe car runs good and sounds, but I noticed I was getting much worse gas mileage. Like less than 200 mile on a full tank. Does anyone know what size are stock tank are. And what is the problem? Do I need a tune?

King Nothing

iTrader: (9)

you need to have the AIR and EGR deleted and a tune for the cats, that explains the horrible gas mileage. i'd be really pissed if my gas mileage dropped to that this i drive 60 miles a day for work

COOKIE MONSTER

iTrader: (5)

anyone else?

MontereyLS1

iTrader: (4)

Probably 2 things....

You're running really rich (do you have a strong gas smell coming from the exhaust?) and need to tune for no egr, no cats, no rear o2's like king nothing said.

You like hearing the exhaust so your foot is a little heavier lol

tripps

iTrader: (7)

I'm having the same exact problem, my fuel mileage has gone to **** on this tank right after my header/exhaust install. I know i'm running rich, but I never thought it would hurt my gas mileage that bad.

Mudvayne

iTrader: (1)

I suffered from this for a little bit

mikenews

iTrader: (9)

Your o2's talk to the front o2's on bank 1 and bank 2. They tell the ecm to adjust for rich/lean condition, u need to have to get tuned and deleted!

bitchncamaro

I got alot better MPG after my tune but my lead foot keeps dropN that back Down

JonB

iTrader: (3)

A good tune and keeping your foot of the pedal should help alot. It's pretty normal to get crappy milage after headers not only are you probably running rich but as everyone else said you want to hear your new exhaust so you keep romping down on the pedel to hear it. I went from getting 18-19 mpg before headers. After headers and a tune I get 22-23mpg.