well today i brought my car to a buddy of mine to show him the new exhaust(used) that was put on 3 or so weeks ago and when i revved it up to around 4-4.5k a little puff of black smoke came out...my oil is fresh for the most part and the car runs fine...he told me that i could need a tune up...like plugs etc....if so should i just do plugs or should i do more for the tune up...any input would be great or if someone had this problem before...thanks

 

ehh nevermind i went and got my plugs changed to the laser platinums again...idles better now didnt check for black smoke though..not too worried about it ..theres not oil in any of my chambers either so i should be good

 

how you like the exhaust?