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I have an ancient style Magnus, it worked good. The Venoms are known to blow out welded above 24psi. Any of them should have a decent impact on top end power. Then plenum volume on the stock intake manifolds are just too small, so adding more volume and short runners help alot in the 7000-9000+ RPM range. The drawback is that with a large plenum the car will feel a bit doggy off boost, which really doesn't show up on a dyno test much either.
The Buschur and VRP designs are pretty much the most basic, they just took a 4" piece of tubing and welded some runners and flanges on to it. Brent Rau runs a similar one to those that he made himself for his drag car.
The ADFX looks like a knock off of the Veilside intake manny for the Supra MKIV.
There have been 2 versions of the Venom, the old one was a huge retangular box, the newer one is more of a rounded tube.
There have been 200 or so versions of the Magnus.
Most require some amount of custom upper I/C pipe work.
Judging by the picture, it looks like the Dejon Tool one has his patented 1/16" thick anti-seal flange for the head.
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