i had megan racing test pipes on my car and i decided i didn't like all the rasp so i decided to install my stock cats back on and after driving like 100miles or so i got a service engine soon light and noticed my car smells like rotten eggs. the code came up too lean... any ideas on how to fix this? my gas mpg is terrible right now.

 

Sounds like you are running open loop. Could be caused by a few things. Most likely your O2 sensors were damaged. I would suggest you reset your ECU first. If it doesn't work... check for leaks and then replace O2 sensors if you still have problems. Good Luck.

 

how do i reset the ecu?

 

Turn ignition to on and waited 3 seconds. "on", not started!
press and release the accelerator 5 times within 5 secs.
Wait 7 seconds, press the accelerator for 10 secs and the check engine light will start to blink
Release the accelerator
Press the accelerator for 10 secs

This will clear the SES light but don't assume the problem is fixed until you drive around.

By the way...how do you like the Megan Racing Exhaust?

 

heres my dyno video..

 

ive read that if you un plug the negatve battary termanial to works? is this true?

 

I've never been able to get that to work on my g...and it appears we have the same year car.