Vance & Hines Twin Slash Dual Slip-On Exhaust

Yes, these mufflers would come with baffles already installed.

As you've noticed with other answers in the Q&A - it really depends on a variety of factors (intake, riding altitude &etc.) - not so much what bike you're putting the exhaust on to. Sure, your bike will run after installing the Vance & Hines slip-on mufflers, but it may not operate at peak performance. You could certainly try running the bike without changing fuel characteristics, but you won't be getting the most out of the exhaust as the OEM ECU can only make up for a limited range of fuel delivery shortcomings. An aftermarket fuel management system in the form of a Vance & Hines Fuelpak FP3 will completely mitigate any chance of less-than-optimal power output, and just as critically - throttle response. While lots of riders want as much power as possible, what's particularly noticeable is the way the engine responds to your throttle hand. If you want to avoid hesitation when you grab a big handful or having the bike stumble at a constant power setting, you will want to make some sort of fueling adjustment along with the installation of this exhaust.

The answer is, maybe. It really depends on a variety of factors, and most often - backfiring is associated with how well the entire exhaust system is sealed up. Usually, it's caused by a leak in the exhaust somewhere. So long as the gaskets on the cylinder head to which the headers are attached are in good shape and the mufflers are installed nice n' straight, you may not have any problems. Still, since modern machines are tuned to run rather lean from the factory, exhaust gas temperatures are rather high and, upon the installation of this, or any other aftermarket exhaust system - you may still notice some backfiring as the engine will be running even more lean. This all depends on where you do most of your riding, and the type of the fuel that you put in your bike. In the event that you do find your bike backfiring, we do have one of the easiest-to-use fuel controllers on the market in the form of the Vance & Hines FP3 fuel management system. With that device, you simply tell it what bike you're riding, the type of exhaust you have and it does the rest. You just need a iOS or Android smartphone and the FP3 app to get it set up. Plus, with the Autotune feature, there's no need to make a visit to the dyno and you can easily re-tune your bike anytime you change the exhaust, air cleaner or any other part that effects the way air gets into or out of the combustion chamber. After all, if you're installing an exhaust to get better performance out of your bike (and the stock mufflers really choke performance) - you might as well go the whole hog and tune your bike with some sort of fuel management system. In this way, you'll be assured maximum performance, the best possible throttle response and minimal backfiring.

While you can often go ahead and install an exhaust (be it a slip-on or complete exhaust system) by itself; to get the most out of your bike, you're better off adjusting fueling to match. Any time you change the way air gets into, or out of, the engine - you will want to modify your bike's fueling in order to get the best possible throttle response and engine power output. Vance & Hines offers three kits that suit their exhausts perfectly as they've done most of the dyno testing in-house and have ready-made maps to work with most popular configurations. If you have a 2012 or newer model, there's a good chance that there's a Vance & Hines Fuelpak FP3 Autotuner available to fit your bike. With that kit, once it's properly configured with the aid of your smart phone - fueling is automatically adjusted while you ride using a myriad of your bike's OEM sensors to give you the best possible power output. For most fuel-injected models up to the 2013 model year, the Vance & Hines Fuelpak or Fuelpak LCD would be a wise choice since programming either of them is simple and - like the previously mentioned FP3 unit, they're very easy to install. There's also a simple map library available from the manufacturer for the Fuelpak/LCD which allows you to configure it to account for some of the most popular aftermarket accessories.