I realize that customizing a bike is intended to change then look. However, certain parts should be left alone, both to avoid damage to the bike, and for safety. The intake system is something you should not mess with at all. However, there are a number of aftermarket mufflers that can be used, IF the carburetor is retuned for them. Those little Emgo mufflers sold by Blue Collar Bobbers seem to be the most common, and seem to work well with the stock intake. Don't run open pipes, they are beyond the tuning range of the carburetor, and will fry your engine. One of the worst mods I've ever seen is replacing the rear shocks with struts. This is a serious accident waiting to happen, literally. Notice how the shock mounts are almost halfway between the rear axle and the swing arm pivot. The Rebel swing arm is very weak, and is designed to be used with springs. Hit a bump or pothole with struts, and the swingarm will crack right at the lower mounting point. And a home made hard tail is no better. Frame building is an art, and a lot of engineering is involved. A hard tail also provides a miserable ride. If you want one, it needs to be done by a qualified frame builder, meaning it won't be cheap. And after spending all that money, you probably won't ride it very much because of the pain it causes. Another thing is ape hangers so high you have to reach over your head tp put you hands on the grips. These are illegal, bu8t worse that that, they take away almost all control of the bike. You might be able to cruise down a straight road for awhile, but turning will be almost impossible. And if you get into a situation that require a quick evasive maneuver, you are almost certainly going to crash, and depending on the situation, you could even get killed. Those building custom bikes, and here it seems to be mostly bobbers, need to keep a lot of things in mind. When you start hacking up engines and frames, you are likely to get yourselves into a whole lot of trouble, possibly even killed. Modifying a factory made bike designed by engineers require a lot of thought and research. My motto is "if in doubt, don't" I have been all the way through the bobber picture thread, and I have seen a lot of very scary and potentially deadly creations.
2016 Rebel, 2013 Royal Enfield B5, 2009 Genuine Stella, 2006 H-D Sportster 1200, 2006 Vespa GT200, 2001 Yamaha XT225
"I refuse to believe in a risk free society where the thrill of living is traded for the safety of existence." — Nick Ienatsch