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The increase in power will depend upon what pipe you are already running. When compared to a
well-balanced stock pipe a power increase of 10% to 15% over the entire RPM range is typical. If you
are running a high-speed pipe you will see only a small improvement in top end power, but the low to
mid range power could easily be increased by 20% or more. If you are currently running a low-end
torque pipe then your low-end power will be similar, but the top speed will be far better. We cannot even
compare power levels at this point because a low end torque pipe will many times not support running
at above ~30,000 RPM. The shortest tuned length of the Buku Power Exhaust System will support
power output to at least 40,000 RPM if the motor has the port timing to support these RPM levels.
A typical setup and installation should take no more than 5 to 10 minutes. Once you begin initial tuning
you should be able to obtain maximum power quickly, within about 5 to 10 minutes. This will also
depend on your skill as a nitro tuner. If you find that you need to change your initial configuration
(either spring or convergent cone) this could add a few minutes. Once you have the pipe properly
configured and tuned it will need very little adjustment. Most likely you will be making adjustments to
suit your preference for varying track conditions
The Buku Power Exhaust System can be configured for virtually any small block (.12 to .20
displacement) nitro motor. The universal coupling will fit two-piece mounting styles as well as
accommodate most inline (one-piece) header designs. Big block models can be configured to fit nitro motors from .21 up to .32. If you are having a problem with fit than call
us and we may be able to custom make a solution for your problem. We machine all of the
components in house and can modify a component if necessary.
The internal movement of the small block model is a little less than 1/2 inch (12mm). In big block models, the internal movement is more than an inch (28mm).
Your jetting settings will most likely be somewhat richer than stock settings. This is because the overall
operating pressure (and fuel tap pressure) is designed to be as low as possible without adversely
affecting performance or tunability. The slightly lower fuel tap pressure will mean less pressure in the
fuel system and this will necessitate richer jetting. The operating temperature should not be
substantially different than a properly tuned stock pipe. You may see a 5 to 10-degree rise because
more power will inevitably produce more heat, however if you are seeing much higher temperatures
than normal, you should use the tuning plug to reestablish a baseline tune and avoid a potentially
damaging lean condition.
The different springs are included so that the Exhaust can be properly tuned for a wide range of motors
and conditions. The high output convergent cone is included for the same reason. There are so many
motors in existence that it would be impossible to properly configure a model for each and every
application. The tuning requirements will also change for the same motor in different conditions. A motor
will perform much differently at sea level in a 50 degree temperature than at a 6000 foot altitude in 100
degrees. The multiple springs and convergent cone allow the tuner the greatest flexibility in setting up
and tuning the pipe for the unique conditions encountered.
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