Well here it is, a Precision 5558 installed with a external waste gate. I went with a log style manifold, which makes checking the nuts inbetween each run a breeze and everything I read the difference between it and a long runner was minimal, and I would much rather be able to access the flange nuts, makes life much easier at the track.
Kris at KO Racing in Oregon city did the fab work, man can that guy lay a pretty bead, looks like a robot welded it. We designed the flange location so no frame cutting was required, easy turbo flange nut access. The down pipe is split with a V band down by the bellhousing so the trans can be removed without messing with the turbo and stuff above. V banded everything except the turbo flange which could have been done but would have had to notch the frame and with the easy access went with the flange mount. Installed the daul psi manual controller and have a button on the left spoke of the steering wheel [we call it the porsche button] which I can press on the straights and it is set to change from 17 psi to 20 psi.
I have flogged the car 2 full track days so far and everything has been flawless, the car is very fast. It ran a little hot the 2 nd day as the air temp got near 90* with high humitity so am redoing the nose and the duct work with a splitter, something like crusher style.
The car dyno'd at 317 whp @ 17 psi and 340 whp @ 20 psi, now I need a Giken diff. in the corners. Here is a link to the build along with some dyno charts. We well be making jigs this winter if everything keeps working as expected for the remainder of the track season so Kris well have this as something to be purchased. KORACING :: High Quality Automotive Parts - Products