jimz

throwing P0420 code, probabley a cat right?

instead of taking to GM

thought about a header installation!

hooker ceramic coated LT'S

ORY not sure if coated

AIR delete

rear 02 delete

a/f ratio adjustment, price for all is 1802.00

do not have time to do it myself this month, and have an emissions test in June

1802.00 WTF, less than a thousand in parts!

spend a couple hundred for single cat?

not going to a dealer.

just trying to find reality in 1802.00

ACW

Here's some information about possible causes of the P0420 code:
https://ls1tech.com/forums/pcm-diagnostics-tuning/41927-code-p0420-keeps-coming-up-what.html
http://www.v8sho.com/SHO/P0420APrimer.htm
http://www.alldata.com/techtips/2003/20031110a.html

This might be correctable by just getting the O2 checks turned off in the PCM. There are a number of people on this board in the Chicago area. You could try asking in the Midwestern forum if someone in the area who has the HP Tuners software would be willing to do that for a small fee