Well all it does is allow oil vapours into the cylinders, its there to stop all the dolphins from going tits up, and the trees turning brown. If you fit a baffled catch can, you can remove all the crap from the crank case gasses before they do any harm to your engine or the dolphins.
3037 with 0.61 was just too savage, 1 bar at around 3000rpm, but it wasnt possible to safely drive the car with any more boost. It came on like a switch, even at 90-100kmh the back end would try and change lanes with light throttle, such as gentle accelleration.
0.87 is sooo much better, still has heaps down low, boost starts building under 3000rpm, with 1 bar around 3700ish rpm - but you can control the boost with the throttle, its not just on or off.