wideband 02 sensor
 

I just bought an 04 lancer evolution and the kid gave me the exhaust he had on the car b4 he put the stock one back one, but they welded the 02 sensor into the exhaust, so im looking to replace it with an wideband 02 sensor but arent sure what to order and i want to make sure i buy the right one......any suggestions?

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its the secondary sensor or lower sensor ive heard it called but itd be going on a turbo back 3 inch straight pipe

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Its pointless to buy the wideband sensor without a controller. I would look around for the whole kit that comes with sensor, guage, and connector cable. There are a couple different brands you can go with depending on the look you want. The three i hear about most often is AEM, Innovative, and PLX

nice....yea ive seen some kits out there.....any good sites out there for import parts that are reliable and that you have used?

just off the top of my head there is
www.extremepsi.com
www.slowboyracing.com
www.dsmparts.com
www.jnztuning.com
www.summitracing.com

But for those you could just about go anywhere and its all the same thing for the wideband. Also you can check out EvoM for vendors. Sometimes they have deals or group buys on stuff like that

i just bought an aem uego comes with everything and it looks nice too. u should check it out. has a digital read out and the colored lights around the outside