[soundman98]

Originally Posted by Irace86.2.0

I agree with manufacturers that all emissions equipment needs to be present and functioning like the EVAP, but as an example, Flying Miata sells a CARB legal turbo kit, where CARB approved the process of cutting off the stock catalytic converter and installing it on the downpipe. I can’t do that and get a tune and prove it is within emissions standards. Well I can, but not without paying a huge price.

and there it is.

that's why.