My opinion when it comes to slip-on vs full system depends on what you are doing with the bike.
If you frequently visit the drags/track and are wanting to get every last bit of power out of your bike then get the full system.
If you are simply a street rider then your stock bike has all the power you'll ever need and you'll never notice the 4 or 5 hp gain. Just get the slip-on for sound and save the coin.
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