Worked on this one earlier this week, about 95% done, full SS construction. We will more than likely be using it on one of our of own projects as its not exactly ideal for your average DSM daily driver.
As it sits this will not clear the hood of a DSM, but the setup we are using it on the motor will be mounted transverse so clearnace isn't an issue there. If i dropped the collector length down to 3" it shouldn't have any problems fitting under the hood of a normal DSM.