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Join Date: Nov 2007
Location: Chandler, Arizona
I of course recommend either a complete unmodified stock system, or an aftermarket system designed for the bike. Butchering up the stock system puts you in unknown territory, and it may or may not be tunable. Aftermarket pipes have less back pressure, but they are balanced, and rejetting will dial them in properly. On the stock system, the "goats belly" and the baffles are what determine the backpressure, and unless you have some pretty sophisticated equipment, there is no way of knowing what modifications have done. Carbs are only tunable over a fairly narrow range of backpressures, if you go outside that range, it will never run right, and will damage your engine.
It is your choice however. If it is a beater bike, have at it with no worries.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike