Need performance advice

rounded corners is the only agreed upon detail. the big square is good, some people do a bunch of holes, some do 2 squares, some do a house shape
 
Put the fredhead on my bike its amazing huge low end power and I ported the new cylinder i got because I did the last one wrong. Goes about 35 now! Also put some holes in the tip of the pipe and the baffle I dont think I need anymore mods now its plenty fast for the bike.
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