Hey, can someone help me solve this problem with my Cts-v that has been eating me away? I recently bought a 2017 Cadillac CTS-V in September of 2020 and within the first week of owning the car, it’s never been performing or even anywhere near what a CTS-V should be. The car came with aftermarket Headers, Cat-Delete, K&N air intake, and Corsa exhaust system. Since the first week of purchasing my car has had a blown header head gasket, burned through engine coolant tank, bad spark plugs, and brand new o2 sensors blown up within 2 weeks of installation. I’ve tried everything and went to every mechanic and tune shop near me and no one has been able to solve the problem for me. I paid $94,000 for the car and am currently $3,000 into repairs and diagnostics costs with no answer. As I drive the car I notice an engine misfire as I continue to make the car go and push it a bit. It does not rev past 4,000 rpm without this shuddering noise (attached in the video below). I took it to a tuning shop and they suggested I drive the car without pushing the boost past 0 on the gauge and the car moves without a problem. The tuning shop also put it on a dyno and immediately removed it after hearing the sound it made when applying throttle. The car also on the dyno saw a knock retard of 17 degrees. Someone on this forum please get back to me with any information that could be of help, as I only drove my car 530 miles since purchasing and it hasn’t run properly since the first week of owning. Thanks also there’s no lemon law that can help me legally where I live.