NRW Design has been working hard and developing a catch can system for the S58 and to work with both the stock valve cover and our billet valve cover.  We set out to do something a bit different and solve some of the negatives of venting to atmosphere.  Mainly smell in the cabin and the oil spray over the engine bay.  Recirculating the gasses is what all auto manufactures do and we wanted to design something that would work similar without sacrificing performance. 

We turned to the old hotrod and drag car concepts and worked on implementing the concept into our new design.   Hotrod/drag cars either ran a bung to their exhaust to help pull vacuum or ran it into their intake to do the same.  This completed the loop and either burned up the gasses in the exhaust or reburned them in the engine.   We did not want to design something in the exhaust as this would create smoke out the tail pipe and look horrible or at least concerning to the unknowing.  Also creating more pollution in the end. 

So we looked at our single turbo and how could we work with it to make something that offered several benefits as well as solving this issue.  We came up with our very own billet velocity stack.  Velocity stacks have been known to add horse power by smoothing and accelerating the airflow into the turbo.  A net win in itself.  We made this from a single piece of 6061 aluminum block and incorporating a screen to help protect larger objects from entering the turbo intake.  Making for 1 sexy velocity stack.  

But this was not enough, we incorporated a 1/8 NPT fitting at the top of our stack to offer the user the ability to add an injector nozzle to spray Nitrous or Meth directly into the mouth of the turbo.  This feature allows the user to speed up the turbine much faster developing more torque and horse power down low as well as lowering the charge temperature to help increase horse power as well as the added benefit of Nitrous. 

Lastly using our knowledge from aerospace we worked on an intake port to help pull vacuum from the turbo to help add negative pressure to the catch can valve cover system.  Though very low vacuum its still better than ambient and will help draw out positive pressures caused by blow by from the engine, thus helping with horse power. 

In the end there are several velocity stacks on the market.  Many designed poorly or designed with profit in mind.  Not many are designed by a single block of aluminum and none of them offer the features ours do.  This is truly a first and with hundreds of hours and thousands of miles driven this has really proven to be hands down the best option when looking for a way to get away from vent to atmosphere and offer many benefits in a single package!