catalytic converter stolen mechanic welled a straight pipe .should my be loud

Hi Carm123, You should know that whomever removed your catalytic converter and installed a bypass pipe is committing a felony. No self-respecting technician or repair facility should be engaging in such practice and is certainly not doing you any favors. Please feel free to visit Interstate Auto Care for a free inspection and quote to correct this situation. Regards, Interstate Auto care customer team