I've owned my evo for a little over a week and I've finally had someone following me that pointed out I had black smoke coming out of the exhaust at WOT. the car has a previous tune the previous owner had done. Only has basic bolt ons. Any idea to the problem? Please and thanks!

 

Get you a Wideband. You gotta know what AFR at WOT before going futher.

 

I have one ordered, should be here soon.

 

2nd the wideband. But also worth mentioning, having some black smoke at WOT is not that uncommon.

It is also always worth going to a professional shop and getting a tune.