Hi everyone, so im new to the bimmer forum and i just recently bought a 2015 bmw M4. So im looking into doing some mods . Im looking into doing a afe high flow cat down pipe & secondary cat delete , but even tho the down pipe has high flow cats i heard that it could thow a check engine light, and to have the check engine light out i need a custom tune which will automatically cancel my factory warranty . So what i really wanted to know is if i do this afe high flow cat downpipe and secondary cat delete with a dinan tune (which wont affect my factory warranty ) will that make the check engine light Not come up ?