esquire7oz Kaz is correct. Pistons and valves burning are caused by a lean fuel mixture. The amount of back pressure you have determines the amount of fuel you will need at a given rpm. I would not suggest running pipes like this on a stock flash.
"I see" said the Blind man! Another SPELLING MASTER! My spelling and Grammer Sucks,but my V-rod is a Rocket!:diablo: You will fit in Very Nicely with the Rest of the Ball Busting Smart @sses on this Forum!:goof Becareful though not to Hurt My Feeling to bad or Else!:icon_twis Only John aloud to do that!
Let me just say this -- as Max left the house this morning, I lay in bed listening to him leave...disctinctly, I heard him leave the garage, go up the alley, turn onto an adjacent street, turn again, turn AGAIN, and heard the first three gears as he went up 14th Street. Which, by the way, is about a quarter- to a half-mile away. This was with the windows closed/air conditioning on (it's hot here).