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Join Date: Nov 2007
Location: Chandler, Arizona
They sell it to make money. They saw a market for it because they saw people doing it on their own. They don't care about your bike, only your money. Scooterworks is not a mainstream parts place, like Dennis Kirk or Motorcycle Superstore, who would never sell something like that. Those places do sell aftermarket exhausts, and tell you right up front that you will probably need to rejet. An aftermarket exhaust is THE way to go, and it will not use the "goats belly" It will not be as efficient as the stock system, but it is not really noticeable. you will lose 2-3 HP. But unless you live at a very high altitude. you WILL need to rejet. I installed V&H Cruzers on mine, and it was too lean. I went up one size on the main jets and pilot jets, and that was perfect. I live at 1200 feet.
If the noise on the road becomes too much, you can wear earplugs to protect your hearing. But 95% of my riding is on the highway, and I chose to go back to the stock system, including the goats belly.
But again, the stock system is precision engineered, and once you butcher it up, it will not work properly, and will also cause engine damage due to an unstable air/fuel mixture at different rpms. Specifically running too lean is what damages engines.
On the other hand, there are many people here perfectly willing to lose tens of thousands of miles of engine life just to get rid of the stock intake system, which requires use of inferior air filters. These filters have been tested many times, and if a stock filter is a 10, one of these things is about a 2, as far as filtering ability goes.
It's your bike, you will have to decide what is more important, engine longevity, looks, or sound. Fortunately, with a name brand exhaust system, with proper jetting, you don't really have to give up anything except a few HP.
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