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timmysgtp

timmysgtp

New member
if I put headers without a cat I know it will throw a code but can I ride around for a while without a tune? How bad will it hurt?
 


MPG will go to **** and you'll foul the plugs out sooner but it won't kill it if you do it for a little while
 
stock cat is gettin a lil backed up I think my mpgs are only right at 20 right now I guess imma go ahed and get a magnaflow cat
 


all cats are usable with headers. you just have to make sure the pipe sizing is right. have you installed the speeddaddy's yet? and what year is your car?
 


benner said:
MPG will go to ****
Click to expand...

no it wont. the rear o2 sensor, the one that will be picking up and throwing the code, will not alter air/fuel ratios.

i drove around 4 months with no cat, and a CEL to go with it, and neither my city or highway mpgs were affected.
 
You will get the catalyst efficiency code if the rear O2 sensor is there and the cat is gone. If you remove the rear O2 sensor, that is where you will end up running rich in the 01+.
 
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