Well i finally went with the HKS SSQV no recirc kit, no Idle stabilizer and my car runs awesome. no stauling, no funny idle. have had no problems with boost leaking...what i do suggest for people getting this blow off valve though, if you plan on venting it...not recirculating..do not use the little aluminum plug that they include to plug off where your stock bov once mounted. its not deep enough, so when you tighten the hose clamp, it sometimes pushes it and mine popped out a few times. what i did was went to autozone (any auto parts store should work) and got one of the universal freeze plugs...its like a bolt, 2 washers and a rubber bushing thing that when you tighten to nut on the bolt, the plug expands. its an 1 1/2" - 1 3/4". then i tightend the hose clamp onto that. but as far as the bovs go...i like the HKS. its a good unit. i have heard of it not working well with evos..but i heard that the 05 has somekind of idle control or something..dont know if its true..but my car works fine with it.