68 fox mini doodle resto

#21
isnt it true that when you take the muffler off it not only gets louder but burns valves cause there is no back pressure. at least thats the way it is on car motors
 
#22
no no no it dont work that way you burn vales when you pipe it to short and it reverbatrates(the sucking of cold air back in through the exasht on decelration due to a lean condition cause bye the fuel suply be cut of so quickyly) on the motors to short is prolly 6 inches and when it hits the vale it can do 1 of 3 thins or all of them it could warp the valve break it burn it up or it could burn up wwarp and the snap all at onece
 
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