Greddy Exhaust System

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Greddy Exhaust System
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The cat back portion of the exhaust system generally refers to the section back of the rear catalytic converter. This includes the resonator, rear exhaust pipe, muffler and tip.

The resonators main purpose is to attenuate the sound of high pressure exhaust gases being forced through the system. Sophisticated units are designed to internally reflect the sound waves so that they collide with one another and cancel out, deadening the noise significantly. It is possible to purchase units that will produce a low growl instead, though this is more for style purposes than practicality.

A muffler is designed to do a similar job to the resonator, albeit to a greater degree. The most basic muffler works on the absorption principle, and uses materials such as fibreglass or steel wire to absorb much of the sound before the exhaust gases are expelled. Another common type of muffler works by restricting the flow of exhaust gases which drastically cuts down on noise. However, this also reduces the efficiency of the exhaust system and ultimately the efficiency of the engine. Finally, more sophisticated mufflers work using the same reflection principles as the resonator combined with absorption materials. These are the best performing mufflers available and provide the greatest reduction in noise possible.

The tip is little more than an outlet for the exhaust gases and come in a variety of shapes and sizes. Most are designed for little more than their sound and visual appearance. It is wise to match up diameters along your exhaust system for best performance, so it isn't always necessary to fit the biggest exhaust tip you can find!

Replacing your cat back system can help improve engine performance and fuel economy albeit to a very small degree. By selecting a system with the appropriate diameter pipes and a less restrictive muffler, you can allow gases to flow more freely and reduce the effort required by the engine to force the gases through the exhaust system.

High performance cat back exhaust systems also feature coated pipes, designed to keep the exhaust gases hot as they pass through the system. This again boils down to density, as hotter gases are easier to force through the exhaust system than cool gases. Bear in mind that larger diameter pipes are not always better, as there comes a point when having too larger exhaust pipe will actually inhibit the flow of exhaust gases.

To get the best performance out of your exhaust system you will also need to replace the exhaust manifold with a header. This aids the flow of exhaust gases away from the engine thus reducing the energy lost expelling gas further still, though this is extra work and inevitably extra cost. If you're looking for a marginal improvement on performance and a better sound then a cat back system is ideal. If you are looking for a real performance boost however, you will need to go one better and replace the entire exhaust system from manifold to tailpipe.

Catback Exhaust Systems [http://www.premiumturbos.com/catback-exhaust-systems.php] can be found in a wide variety at PremiumTurbos.com. Performance catback exhausts from names like Flowmaster, Borla, Gibson and Greddy. All to help in the performance of your vehicle and promote finer engine efficiency.

Vince Blackham - CEO

http://www.premiumturbos.com

Enhancing your Porsche 997 Turbo

In the tradition of powerful Porsche sport cars, the Porsche 997 is the proud successor of the 996, which ceased production in 2004. Also known as Porsche Carrera, and part of the long going 911 family, the 997 started with two models, the Carrera and the Carrera S, all-wheel drive models like the Carrera 4 and Carrera 4S being added one year later, in November 2005. Later, Porsche presented the Targa, Turbo , GT3 and GT2 line of models.  The body styles available for the 997 line of sports cars include either a 2 door coupe or a 2 door convertible, and you can choose between a rear wheel drive or an all wheel drive layout, with a 3.6L H6 to 3.8L H6 engine. The faster car of the 997 line seems to be the Turbo version, as it can accelerate 62 mph (100 km/h) in 3.9 seconds if equipped with the manual transmission, and in 3.7 seconds if using the Tiptronic S transmission option. Some tests by motoring magazines like Motor Trend managed to get a time of 3.2 seconds for a 60 mph speed, which places the 997 Turbo even before the Porsche Carerra GT. The official top speed is of 193 mph (311 km/h).

The price is of about $130,000 for the normal Porsche Turbo and slightly higher for the Turbo Cabriolet version, which comes at about $140,000. Both models are equipped with the same 3.6L dry sump engine that develops around 470 HP (350kW).

This can be taken even further if you choose to install a 997 turbo exhaust, which can add up to 30 hp to your engine, automatically upgrading the car’s performances, like the top speed or acceleration factors, while adding that particular power sound that makes everybody turn around when you drive down the street.

If you choose a quality crafted 997 turbo exhaust (like the ones offered by VividRacing.com and such), you can also be sure the looks of your car won’t be altered, as these polished stainless steel exhausts are made to fit perfectly.

If interested in this addition just visit VividRacing, and if you are curious to know more about turbo kits (for different car models), try Greddy.

About the Author

Matt DeLaco
http://www.vividracing.com

How much horsepower does a GReddy Evo 2 exhaust add to a Acura Integra?

I've got a 2000 Integra LS. Base horsepower is about 150. I just installed the Evo 2 system, it sounds great and feels like its pulling harder. I'm wondering what the hp and torque gains are.

OK to correct the HP thing. It has 140 hp stock AT THE CRANK, at the wheels the Integra puts out between 113-117. The Evo2 exhaust has been tested numerous times and depending on temp, type of dyno, and other little variables it makes between 2-6 more wheel HP.

Managing your engine
In light of my late March and early April columns, I've been getting inquiries regarding Engine Management Systems, commonly referred to as EMS.

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