On the old '85 244Ti I ran a G-Valve in the long hose, on the '92 745Ti I had it in the short hose, the short hose seemed to provide the best most consistent control, very little difference at all really and the difference could well be accounted for by the totally different equipment.

As to intercooling the car, cooler air at 6psi will be denser and therefore provide a bit more power than hot air at 6psi. As the air goes through the intercooler it will become denser, this is simple physics. The bottom line is 6 psi of cool air is way better than 6psi of 200º air.

With the short hose you have the wastegate measuring the pressure from the hot side of the intercooler and it will also measure the pressure loss across the intercooler, all in all with the cooler intake air it may be a wash. In the short term I world run a long hose from the nipple provided in the new intercooler hoses and that way measure the actual boost received by the intake manifold.

When you get your boost controller you can plumb it any way you want and adjust the actual boost at the manifold with the controller. You do have a calibrated boost gauge don't you? This is the first thing you should get!
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Dave Shannon
Spring Valley, California
'67 1800s
'73 1800ES
'88-240
my pages