Same, here... was driving around with a worn out DV and N75: car is totally different, with the boost levels and system working correctly! 
Also, check all the "check valves"; some of mine, were corroded and falling apart.
http://newbeetle.org/forums/1-8-lit...ock-motor-apr-aftermarket-vs-stock-bosch.html
Another thing I did; which I recommend you do, check all the hoses on top of the valve cover that connect to all these boost related components. I went ahead and bought a bunch of small "pex" clamps/fittings; which are similar, if not the same as oetiker automotive crimp style clamps and clamped ALL of the connections to everything. Some of the connections were loose and I replaced allot of the plastic "t's" with brass fittings, that are part of the same pex system, at your typical hardware store or home improvement center (you can also, use these to replace coolant hose "t's" that break so easily). The mess of hoses on top of the valve cover; is all one assembly, which was over $100, so as a interim solution (all silicone hoses would be nice).... I just sealed all the possible leaks. All new valves; sealing all the hoses and checking everything, really made the boost system come to life!
Get some PEX clamps, fittings and fix all those possible leaks!
Also, check all the "check valves"; some of mine, were corroded and falling apart. http://newbeetle.org/forums/1-8-lit...ock-motor-apr-aftermarket-vs-stock-bosch.html
Another thing I did; which I recommend you do, check all the hoses on top of the valve cover that connect to all these boost related components. I went ahead and bought a bunch of small "pex" clamps/fittings; which are similar, if not the same as oetiker automotive crimp style clamps and clamped ALL of the connections to everything. Some of the connections were loose and I replaced allot of the plastic "t's" with brass fittings, that are part of the same pex system, at your typical hardware store or home improvement center (you can also, use these to replace coolant hose "t's" that break so easily). The mess of hoses on top of the valve cover; is all one assembly, which was over $100, so as a interim solution (all silicone hoses would be nice).... I just sealed all the possible leaks. All new valves; sealing all the hoses and checking everything, really made the boost system come to life!
Get some PEX clamps, fittings and fix all those possible leaks!
