I guess you here this enough, but Im just starting out here and probably asking some stupid questions, so bear with me.

Im getting ready to make/install a 9 plate system on my 08 Wrangler. Probably with the +n-n+n-n+ setup. Im going to go with distilled or rain water with baking soda or salt. I dont need someting thats going be melting someones arm off. At least not untill I get a better understanding of what Im doing

I know alot go with the stainless steel but I got some aluminum plates laying around and was wondering if anyones tried that. Also would there be any hazzard gas comming from something with aluminum.

Also found out that I got a grand total of 4 02 sensors. 2 in front and 2 behind the converter. So does this mean that Im going to need two effies plus something to to use with MAP?