Has anyone tried modifying twin pipes to fit in the stock can. I am trying to get a summit 670 running for a beginner as cheap as possible. Would it be good?, bad?, about the same as stock set up? Will back pressure be a problem? It still has the same amount of exhaust going to the can with twins or stock pipe, right? Dont some companies sell twin pipes that fit to the stock can? I am guessing alot depends on the specific sled? What do you think???