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Q. Could I pay my order by using a credit card?
A. Both Paypal and Google's Checkout can be used to check out, they would accept any credit card you are using, without registering an account with Paypal.

Q. What's performance muffler?
A. An engine is an air pump, and the exhaust system allows the engine to pump and flow more uninterrupted air. The actual horsepower increase depends upon the fuel management system's ability to provide the right amount of fuel to match the extra air flow; 5 to 15% increases are not uncommon.
Our exhaust systems’ patented, straight-through design increases exhaust gas velocity and moves more uninterrupted air through the engine. Since there are no restrictions, exhaust gases evacuate the cylinder completely, thereby allowing the new charge to come into the cylinder and create more power. The result is a larger volume of torque from the engine as well as an enhanced exhaust tonal quality.

Q. But which muffler should I choose?
A. If you're running on the street--or in many racing series--you need mufflers. They also come in handy during long drives, when the drone of the exhaust can be downright exhausting. But which muffler should you choose? It depends on your taste, your engine, the space available on your vehicle and how you use that vehicle, too.

After all, a muffler can be used to tune your engine's power band, so that it makes more peak power (a good goal if you're drag racing or hitting the Autobahn) or more midrange torque (preferable if you're road racing or driving on the street). By its nature, a muffler also will have a profound impact on the way your vehicle sounds. Often, you can find several mufflers that provide comparable performance for your application, but one is quiet, one's loud and another is somewhere in between. Our universal mufflers offer some other advantages over stock units, too. For starters, most of our mufflers will last considerably longer. Some even come with a lifetime or million-mile warranty. Performance mufflers also can improve your vehicle's fuel economy by helping the engine become more efficient. And because some mufflers come with exhaust tips already attached, a simple swap can make a styling statement, too.

Q. What's aftermarket muffler?
A. Our products are produced by companies other than the original manufacturer but are made to fit and perform as well as the original. Aftermarket companies buy the rights to reproduce these parts and supply them to the same wholesale distributors as the OEM parts. These parts are generally produced with the same machinery and materials but because they were not designed in the same manner the part may have differences in appearance and feel. Some aftermarket companies, upon getting the right to produce a part, may indeed find a way to improve a part by redesigning it. This results in a better part and quite possibly a less expensive one. There are a variety of high quality aftermarket parts that can be purchased and live up to all the expectations of the original at a much lower price.

Q. Will It Fit?   
A. Obviously, mufflers come in different sizes and shapes. That's why it's important to look under your vehicle--or check with the manufacturer's tech department regarding dimensions--before you buy.
Many mufflers are available in a variety of configurations, with single or dual outlets, and with offset or center-to-center inlet and outlet designs. Some companies offer different tubing diameters and different case lengths, as well. You’ll need to choose the right combination of options, especially if the rest of your exhaust system is stock. After all, you’ll need to match the muffler to the pipe coming off your catalytic converter (or, in cat-free applications, to the pipe coming off your header collector).
It's also important to have sufficient ground clearance, since beating your muffler against curbs and speed bumps will severely affect its longevity. Several manufacturers offer low-profile designs--or models with offset outlet locations--specifically to accommodate the in-the-weeds crowd.

Q. Single Or Dual Exhaust?
A. Typically, a vehicle with single exhaust has one muffler and a vehicle with dual exhaust has two. But there's an exception to every rule. Sometimes, space considerations under a vehicle--typically a pickup truck or SUV--force automakers to run dual exhaust through a single muffler. That's why some mufflers are available with dual inlets.
If you have single exhaust on your vehicle but prefer the look of dual exhaust, you can swap on a muffler with dual outlets. Just be sure there's enough room for two tailpipes. For instance, on trucks, you need to watch out for interference with your spare tire, hitch and bumper or roll pan.

Q. Is Bigger Always Better?  
A. We've all heard rumors of people who swap on a bigger exhaust system and actually lose power. How can this be?
"An engine needs a certain amount of backpressure , or resistance to flow, below the torque peak of the engine," says Muffler Guru. “When you take away that restriction, ... the engine loses quite a bit of performance below torque peak, which is right where you drive for gas mileage and towing, when you're just driving around stoplight to stoplight, accelerating away from a stop.
"An oversize exhaust will not hinder performance at high rpm. An oversize exhaust system would do about the same at high rpm, but you would lose power at low rpm. So the bigger is better theory doesn't work on exhaust systems."
And we aren't just talking about 1 or 2 lb-ft of torque, either. "If your engine’s torque peak is 4500 rpm," says Guru, "you spend a lot of time below that peak, which is where you lose your performance. And it can be significant. We've seen losses of 20 or 30 lb-ft of torque, and if your engine only makes 150 lb-ft to begin with, you're losing 20 percent." The key, once again, is to get the right muffler for your vehicle, your engine and any modifications you've made.

Q. Tell me something about your Muffler Designs   
A muffler's purpose is, quite simply, to muffle the noise produced by the engine. When it comes to high-performance mufflers, there are essentially three designs: cancellation, absorption and diffusion.
A cancellation muffler features chambers inside, which tune and cancel various sound frequencies.
In an absorption muffler, the exhaust passes through a perforated tube that's wrapped in sound-deadening material. Various kinds of packing material are used to absorb sound, including fiberglass (hence the term “glasspack”), stainless steel mesh and ceramic products. Absorption mufflers often feature a straight-through design. Some hybrid models, including “turbo muffler” designs, also use cancellation-style chambers to help muffle sound.
A diffusion muffler uses diffuser plates at the end to split up the sound so it follows many different paths. The sound coming out of this type of muffler can be tuned by adding or subtracting diffuser plates. (Contrary to what you might imagine, you get a quieter exhaust system by running fewer discs.) Some hybrid diffuser mufflers also use absorption material to reduce decibel levels even further.

Q. Better Performance & Gas Mileage, really? 
A. Virtually all factory mufflers are designed to be quiet. Power is a secondary concern. This means you typically can reap performance benefits by swapping mufflers.
How does a muffler improve performance? At the most basic level, by increasing exhaust flow. Virtually all specialty equipment mufflers are less restrictive than stock-style units. Because more exhaust can pass through at a given time, backpressure in the exhaust system is reduced. Some of our mufflers even create a scavenging effect.

Q. What's Scavenging Effect, anyway? 
The ultimate performance gains are to be found when an exhaust system, including the mufflers, creates a scavenging effect. This can increase horsepower, torque and fuel economy, all at the same time.
“Scavenging is when a [reflective] low-pressure wave comes back up the header pipe,” says Muffler Guru. “You want it to get back to the exhaust valve when the engine is in overlap. It creates a low-pressure area at the exhaust valve and aids in the induction charge, ... getting your intake flow started into the cylinder.”
The diameter and length of your exhaust pipes, your muffler design and your cam timing are all factors that affect scavenging.
“When you get this optimized,” says Guru, “you can get a boost in torque. Between that tuning and the intake manifold tuning, that’s how you can achieve over 100 perfect volumetric efficiency on a naturally aspirated engine.” A variety of high-performance mufflers are designed to enhance this scavenging effect.

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