I have a Black 97 VR4. So far I have turned the boost up to 15psi with an HKS mbc and installed a K&N FPIC forced injection kit. For my next upgrade I was hoping to drill out the precats and main cat , and maybe add a downpipe. I have read that sometimes this causes problems with 96 and newer VR4's because of our extra o2 sensors. Is this true?? If so, how can I remove my cats without freaking out my ECU???