Tailgunner Exhaust Systems

Rotary Cannon's Gunship, Mach II, And Jet-Pipe

1. Here are the three styles of slip-ons we are going to test: From left to right, the Gunships, the B-52 Jet-Pipes, and the Mach II.

2. After the bike and the stock pipes cooled down, the saddlebags were removed and set aside on a packing blanket. Then the mufflers were removed from the header pipe. Shop tech Nolan loosened the pipe clamp using a 9/16 socket, then the two 1/2-inch bolts on the hanger brackets.

3. The first set of slip-ons were the Tailgunner Mach II Classic mufflers; the pipe is 4 inches in diameter and 29 inches long, and can be shipped with a 16-inch removable power baffle for a quieter ride or a 10-inch power baffle for a more aggressive sound. The nacelles (end-caps) are CNC-machined and available in either an anodized stealth black finish that won't change color, or polished aluminum. MSRP $549.00 as seen here.

4. For the install the stock clamp was re-used after being inspected, then slid onto the Mach II. Next, the pipe was installed onto the header pipe and the exhaust clamp was tightened. Then the 1/2-inch hanger bolts were installed and the pipe was wiped down to clean any fingerprints.

5. After the dyno run, the bike reached 62.9 hp and 73.8 lb-ft of torque. A slight gain; not bad for a slip-on with no tuning.

6. We placed the bags back on the bike to see how they looked. Nice, clean, and much cooler than stock, and for some people that's all that matters. But for the guy who is looking for something a bit more, Tailgunner has something for him as well.

7. The B-52 Jet-Pipes were tested next. The bike was placed back on theDyno and the Mach II was removed and replaced with the Jet-Pipes. The B-52 Jet-Pipes feature a solid billet polished thrust-cone nacelle. You can also get them in chrome, polished, or in a stealth black finish. They come complete with high-bypass ventilation holes for styling. MSRP $795.00 as shown here.

8. The B-52 Jet-Pipes were bolted on, wiped down, then run on the dyno. Once the bike was up to speed and temp, the numbers were 62.4 hp and 75.7 lb-ft of torque.

9. Just like the Mach II, it was as easy as one clamp and two bolts per pipe to install.

10. Next were the Gunships with their spinning turbines. The faster you go, the faster the barrels spin. As with all their pipes, these are handcrafted in America and are triple-chrome plated with show-quality finishes, and are available with or without full-length baffles.

11. Once the B-52s cooled down, they were removed and the Gunships were installed. They slipped right onto the header pipe; a great fit and easy to install. Then both the 1/2-inch hanger bolts were installed on both pipes.

12. The pipes were installed and the bike was fired up. At first we noticed that one side was spinning faster than the other. The left side was moving, but not as fast as the right side. We realized that we needed to get a set of true dual headers. True dual headers provide improved performance, equal exhaust pipe flow, and allow for even barrel rotation.

13. One more dyno run and the Gunships pushed out 63.6 hp and 75.7 lb-ft of torque. The sound was good, pushing a deep, ripping sound on acceleration, and throughout the pull it remained heavy and throaty. Anyone with some basic tools could install any of these muffler in less then an-hour and have an exhaust that's cool looking with good sound and some power gains. To see and hear a clip of what all the pipes sound like, visit HOT BIKE at www.hotbikeweb.com.

What are we looking at here? Is this the real deal or is it just a crazy novelty? That's what we thought when we first saw the Gunships from Tailgunner Rotary Cannon Exhausts on a bagger. One of the first questions that came up in discussion was, "What do the mufflers do?" It was then that we discovered that the end cap on the Gunships spun, kind of like a Gatling gun. We thought to ourselves, OK, this is something different, something crazy.

The guys at Tailgunner told us that they have seen a lot of exhaust systems on the market that have a gun-type look and seem to be more stylish than functional, so they designed a cool-looking pipe that sounded good and added power to a motorcycle using their "Tailgunner Technology." When the turbines on the Gunship pipes are spinning slowly, they produce a small amount of backpressure. When the turbines spin fast they act as a siphon, drawing the exhaust out and creating a free-flowing system. By demanding a small amount of backpressure at low rpms and minimal backpressure at high rpms, you get an overall increase in performance through the power range. We also found out that Tailgunner had a couple other slip-ons for baggers from '86'-'08-the B-52 Jet-Pipes and the Mach II. B-52 Jet-Pipes have a two-piece turbine as well, but it is static (non-spinning). The inner blade is off set to the outer blade creating the needed backpressure, and looks like a jet turbine. The Mach II has clean, simple end-caps and flow-through power baffles that come in 16-inches for a quieter ride or the 10-inch baffles for a more aggressive sound.

We called Horn Cycle Works in Pomona, California, to put the Tailgunner pipes to the test. Shop owner Curtis Horn told us he had a stock '08 Ultra Classic up on the dyno and pulled 59.6 hp and 72 lb-ft of torque. The customer would love see the pipes at work and get any extra power.