OwenEj20x Posted April 3, 2023 Share Posted April 3, 2023 My cats on my ej20x are pretty clogged and I need to remove them. I don’t wanna replace them with new ones i just want to do a downpipe, will i need a tune for the catless downpipe? Link to comment Share on other sites More sharing options...
KZJonny Posted April 3, 2023 Share Posted April 3, 2023 If you’re going from a stock pipe to aftermarket, definitely yes. If removing cats and welding in straight pipe in place, most likely still yes, outside chance you can get away with it, but probably getting into overboost territory. Link to comment Share on other sites More sharing options...
Pleides Posted April 3, 2023 Share Posted April 3, 2023 Yes, you will have a check engine light at the very least if you don't. Link to comment Share on other sites More sharing options...
AWDFTW Posted April 4, 2023 Share Posted April 4, 2023 Yup. Link to comment Share on other sites More sharing options...
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