emissions is not a problem i dont have to do those on these county and neither is noise. As of now I'm thinking on doing a little of both. thats why i oppened this thread to see if it was better to do one or the other, or if both together would work better for me because i have never owned a SP or a BP i had normally just rebuild the engines and wouldnt mess with porting it's just something new for me. but i really appreciate all the advices and the guidance and will appreciate the next ones to come.