Tune required for o/r setup?

NewDuuude

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Is a tune mandatory to run cat less exhaust in our cars?

Short term.
 

FIVEHOE

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correct me if I'm wrong but I'm pretty sure it is required if you do not want the heavy gas smell. Tune eliminates that if I'm not mistaken (still kind of learning myself)
 

el jefe 302

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All the tune does is get rid of the CEL from cat system under efficiency. You will still get a heavy gas smell because there is no longer a super hot catalyst to burn off vapors.

however some people have had luck running anti foulers on the rear 02 sensors and have not had a CELight.

For the short term just run it as is and deal with the light (Short term)
 

NewDuuude

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Appreciate it
That's what I figured as that's how I did it short term in my other GT's and cobra
 

manolith

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you don't need a tune but the gas smell will be even stronger without the tune because of the cat over temp protection.
 

beefcake

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yep, one of our lund tunes would also make the car run better, better throttle response. just all around better
 

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