ASPX Wide Band
Look on amazon or ebay for an AEM. Have a couple of friends that have them in use.
I have an old school LM1 that has worked great.
The Kevco line is probably because their oil pans usually have some wire spatter/slag in them that needs some attention. Those welds are some of the ugliest "chicken shitting molten metal" workmanship I've seen. I'd be embarrassed to post a photo if my work quality was that poor.