catless xpipe

[GT40Mustang]

i wanna put a catless xpipe on my car but cant get a tuner yet so the cel doesnt come on. My question is will it do any damage to the car till i get a tune for it?

 

[Wicked One]

Won't do any damage, but will not run very good. The cats have an o2 sensor in them, the catless has rear o2's also, but the pcm reads them differently with cats.
You can get an email tune for that, don't need a fancy dyno tune. Real speed or American muscle, both site sponsors can hook you up. Much cheaper also than a dyno tune.
The rear o2's need to be turned off in the tune.

 

[1990_LX]

I bought spark plug defoulers, drilled them out, screwed the O2 sensors into them and then those into the pipe and no CEL here. Not the best but certainly the cheapest and your car won't know.

 

[GT40Mustang]

Thanks for the info . I think I'm gonna use the spark plug foulers for now whenever I put it on