A mechanic (who I don't trust) diagnosed the noise my 95 Explorer XLT was making as a bad catalytic converter. I got a $700.00 quote to replace it (I believe he was going to replace both of them.) QUESTION: Can I order this part somewhere and install it myself?...or am I going to have to shell out 700 bucks? Any part number or reference would be helpful. I'll make an effort to comply with EPA guidelines by putting the right one in the right way. Thanks in advance.