Can I hollow out my catalytic converter can I knock out the cone out of the cat

Hi! this is Bo with Car Genius! Taking the catalyst material out is against federal law. There are great aftermarket solutions that are more cost effective. Does seem like there's blockage in the exhaust? Also, is the dreaded check engine light on? If so you can have the code read at a parts shop. If you have any other questions feel free to give us a call at (877) 913-1554