To suit the tastes and needs of different drivers, Kakimoto Racing has a variety of different exhaust lines. Some vehicles will have multiple lines available, which will change the sound characteristic, appearance, power, and weight in completely different ways. 

The class KR offers an OEM+ solution for those customers looking to get all of the benefits of a performance exhaust without the increased noise. In Japan, the regulation targets a sound of 82 DB or less for acceleration, which the class KR was designed to meet. Through clever sound tuning, Kakimoto's engineers were able to improve the sound profile without increasing the noise. After all, if the exhaust sound is terrible and also loud, it reduces the overall driving experience. The "Double diffuser tail" used in the class KR muffler uses two pipes in a single enclosure, with the main exhaust gases being emitted from the inner pipe while lower-pitched air flows through the outer pipe, producing a deep and high-quality bass tone from the exhaust. It is through methods like this that Kakimoto can achieve an improved sound without increasing the sound level (decibels).  Through the use of a class KR muffler, you can also expect increased responsiveness, power & exhaust flow, and reduced weight. All class KR exhaust units are constructed from 304 stainless steel (some units may use a titanium exhaust tip as a bonus). 

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The Kakimoto R exhaust system is an excellent all-rounder exhaust, providing a deep, bassy exhaust note and providing high torque and horsepower. Much like the class KR, the Kakimoto R is an excellent upgrade over stock for those who are not looking to go over the top.  

The Kakimoto R uses the same "double diffuser" muffler design as the Class KR, which has an inner pipe where exhaust gases exit from, and the outer chamber. This two-pipe construction has a number of benefits. The double pipe design creates a layer of air in between the two pipes which regulate the exhaust note while also providing a passive cooling effect. The outer chamber also creates the deep bass tone that is signature to this exhaust system. 

By keeping the inner pipe away from the car's bumper, it reduces the chance of contact burn as the heat is not concentrated to the exterior of the piping.  The inside of the muffler is also a straight-through type which promotes good exhaust flow and horsepower at high RPMs. The size of the muffler ensures proper exhaust pressure so that adequate torque is available at low and medium speeds. 

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In cannonball-type mufflers, reducing exhaust noise is difficult due to the structure of the exhaust system, as peak power is the main requirement for exhausts of this type. Many companies have attempted to quiet down these cannonball exhausts by fitting an inner silencer, however, these greatly increase the exhaust pressure and reduce the torque output of the car severely. Ultimately, an exhaust designed in that fashion sacrifices power and exhaust tone for the pursuit of a lower sound output (decibels).

 One of Kakimoto Racing's philosophies of exhaust tuning is that you must increase the power output when replacing the muffler. A problem with standard cannonball mufflers is that they tend to only add power at the peak, completely neglecting the mid and low-speed ranges, when many cars used for street driving thrive in the mid and low-speed ranges. To increase the enjoyment during street driving, the horsepower gain must be there at every place in the power band, with the torque increase in the low to mid sections. 

Through a nearly impossible feat, Kakimoto Racing was able to create a cannonball-style muffler with absolutely zero compromises. An inner silencer was used, however, the internal structure of the silencer was specially engineered to adjust the expansion and contraction of the exhaust pressure. By making sure that the pressure does not rise or fall too much, the silencers do not rob any power, in fact, they increase horsepower all throughout the power band, with an increase in low-end torque. Every Regu.06 exhaust system uses a fine balance of the muffler/silencer type, pipe diameter, and shape (bends). 

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For those motorsport-oriented customers who are seeking a high-quality cannonball-type exhaust, the Kakimoto HYPER FULLMEGA N1 + Rev takes it a step higher toward the performance side compared to the Regu.06 & R.  

Since cars driven heavily in performance conditions will spend a great deal of time in the higher RPM range, Kakimoto Racing's main goal with this exhaust system was to improve performance in this sector. In order to do so, the removable inner silencer design of the Regu.06 & R was removed entirely. The exhaust pressure generated from the inner silencer removes some top-end power; using an exhaust system with a removable silencer without the silencer creates more top-end power, however, there is an enormous increase in noise and torque from the low and midrange of the power band is removed.  

The solution was simple - to use a specially designed center resonator along with a removable rear sound reducer. By switching to this system, you can expect improved exhaust efficiency and increased performance at high RPM, with the ability to reduce noise with the sound reducer installed. Kakimoto Racing's sound reducer is specially designed to reduce noise to the JASMA standard without the use of an internal silencer.

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The GT1.0Z Racing is the ultimate racing exhaust from Kakimoto Racing and is a product for serious racers who are looking for an incredibly lightweight exhaust that provides the highest amount of exhaust flow possible. If you're the type of person looking to shave 0.1 seconds off your lap time, this is the exhaust for you.  

The 1.0 in the model name refers to the material thickness of the piping, which is 1.0mm. The attachment rods are hollow to further decrease weight. The main pipe is designed to be as straight as possible with minimum bends, allowing for maximum exhaust flow (N/A cars have a sub-muffler to retain low-end torque). The amount of flanges has been reduced as much as possible to decrease weight. For an R32 GT-R, a GT1.0Z weighs half the weight of the factory exhaust system, while providing much higher power output due to the larger diameter piping. 

The concern of owning an exhaust with a pipe thickness of just 1.0mm is understandable. Naturally, this exhaust will not have the same durability as the other exhausts within Kakimoto Racing's lineup. Extra care has been taken by Kakimoto Racing to ensure the long life of the GT1.0Z. The material used is SUS304 stainless steel, which is the same durable material used in the rest of Kakimoto's exhaust systems. with floating locks using t-bolt clamps to ensure the metal does not deform during the tightening of the slip-on parts. In addition, the parts such as the clamps, main pipe, etc can be purchased as repair parts. 

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