I tried the idea out this past summer due to high ambient temps during the day. I bought another TT intercooler and put it in the void in the driver side duct ( had to remove the Window washer bottle). Had the pipes bent at a local muffler shop. Only problem was that I had to rotate the intercooler to fit (verticle instead of horizontal). My impressions,.... I lost about a few pounds of boost .. 2 psi I think.. and I compensated by turning up the boost on my GReddy Profec B. Also full boost came on 500-600 rmps later than normal....
So in the end I had to crank up the boost so my turbos had to work harder and I didn't see all the power for a split second later.... I went back to the stock intercooler. I will later try to take apart the cores and have a new larger intercooler made with two or three cores in Paralle and not in a series.