Sure doesn't look stock. Looks like a 4" piece was welded in there. Can't answer your other question though...
1985 250r-LED Performance 4mm Stroker motor
1978 ATC70 w/ Piranha 140cc
1972 - K1 - CT70 w/lifan 125cc
2017 YZ 250x- Braap
Youtube channel = http://www.youtube.com/user/ter5678/videos
Stock extended arm it looks like.
And that was the precursor to FMF.
why do you ask about Don Emler? take a picture of the cylinder head for us, please. An FMF Porcupine head hasnt popped up in a while
Bill so it is a stock arm that has been extended or Honda made a stock extended swinger?
Stock arm that has been extended.
1985 250r-LED Performance 4mm Stroker motor
1978 ATC70 w/ Piranha 140cc
1972 - K1 - CT70 w/lifan 125cc
2017 YZ 250x- Braap
Youtube channel = http://www.youtube.com/user/ter5678/videos
Don Emler is the president of FMF exhaust!!