What makes the stock air filter box more efficient than a cone or other custom setup?  Is it the pressure/flow setup from the shape?

Eegore wrote on 07/19/17 at 08:29:14:


With the cone arrangement, the air flow is turbulent and misdirected as it enters the carb - and there is little or no established flow to help dampen the pulses of the intake air.

The stock airbox has a smooth length of tubing between the filter and carb that allows the air to establish an "average"flow that softens the pulses - and that allows more air to flow when you are using a lot of throttle (It also reduces the noise of the intake).  Most modern engine builders tune the intake plumbing to maximize the air flow and reduce noise.

Eegore wrote on 07/19/17 at 08:29:14:

The stock carb has a port on the upper portion of the intake that greatly benefits a straight portion of duct leading to the carb.
There are a few pod filters out there that block this port entirely and the performance of the carb suffers.
Generally, if you put a straight duct the same length as the stock rubber ducky, performance is restored.

metalbrian45 wrote on 07/18/17 at 05:45:32:



If you absolutely HAVE to have a drag pipe, take a look at the ones Raask and Blue Collar Bobbers (BCB) used to sell.  Both had the baffle placed about where your right footpeg sits.  

I can't help but ask, does it still have the original, 14 year old tires?

I would clean up the jetting with the stock or Dyna first.  Then, once you have a baseline, experiment with you're idea.  This way you'll know how bad, or not you're hurting the performance.