My MCS has less then 3000 miles and I dont drive it much but when I do drive it and get on it it blows out a little black smoke. it is not all that noticable to me but people that ride behine me tell me about it. I have a 15% pulley, MTH and a intake. could the MTH be causing it to run to rich and cause this?

 

according to my very short auto mechanical knowledge, black smoke from rear = running pig rich.

 

Hmmm so I wonder if the MTH software is making it run rich.

 

I wouldn't worry too much unless it's doing it all the time.

 

Actually, MTH should lean out the mixture just a bit which will give more whp.