hello i am new to this hole forum thing so if this is not exactly right im really sorry anyway i need help. ok i have a 2003 gmc sonoma 4.3l and i want to remove the cat but the 02 simulators (casper electronics) only go up to a 2002 and the guy there said its becuase gm changed there software on the new models so i would like to know if anyone else has just removed the cat and left the sensor or tried anything else becuase some people say that it doesnt hurt anything and others say that it will run rich and hurt the engine in the long run just would like to add headers and custom y pipe but want to get the straight answer about all of this oh yeah summit and jegs were no help any advise would be muchly appreciated thanks

you can also get it tuned out rather then buying o2 sims.

If You Had A Hemi You Wouldn't Have That Problem!!

If You Had A Hemi You Wouldn't Have That Problem!!

Hemi-equipped trucks still have cats buddy :eyes:

you dont know this one then do ya fella.........

Lets try to keep this one on topic guys....

One of the things you COULD do is chase part numbers for the stock 02 sensors on the 2002 and your 03. If the replacement 02 sensors are the same part number for both years, then I'd ASSUME you should be able to just order the 02 sims for the 2002 and use them on your 2003.

actually a quick search came up saying they're different part numbers.... maybe cross reference your stock 02 sensor part number, and see if it fits any different vehicles, then look for an 02 sim that fits the different vehicle? Sometimes a part will fit multiple vehicles but won't be listed for all of them... good luck.

he came across something on another forum were you screw the o2 sensor into a series of spark plug sheilds( for motors that use oil and foul plugs) and into the exhaust pipe to restrict the fumes to the sensor and trick it into seeing normal a/f readings. we have seen were people with everything from import cars to off road trucks have used this method and got very positive results.

If you want to make your truck faster why not just get it tunned, then tune out the rear 02. Does not cost that much for the gains you get across the board.

every day at work i try to talk him into a custom tune, but he is not ready to spend the money to get it tuned. it really is the way to go no matter what you drive. anybody with the right software can double the performance gains or even more than that over any handheld.