Bought a CX Racing blow off valve and it has been fine for about 6 months but now it's fluttering and not doing the standard pppssshhh sound. I put the stock valve back in and it's back to normal. I read some reviews that this tends to happen with the cheaper quality valves like the ones that CX sells. I should have listened to them because now this thing is junk. Probably going to buy either a Forge or Turbo XS next since they are higher quality and less likely to fail or cause flutter. From what I understand, flutter is caused by the spring failing inside of them. This isnt wastegate surge for those who are thinking. It's def BOV flutter for sure.

 

HA! I had a CX Racing for my very first BOV. It lasted maybe 3 months at the very most. I have an HKS SSQV now and although it is kind of loud, I'm going to be getting rid of it for a Forge come next spring. Not worrying about it now since the car is going away for the winter in about 2 weeks. But yeah....if it's cheap and too good to be true, then stay away. Chinese brands, ebay specials, and CX Racing BOV's will give you trouble at some point.

 

I had a Synapse on my Z, and now have it on the Tib. Very well designed product with no ricey noises.

 

+1 on the Synapse, great BOV. Piston pull style, so you shouldn't have any leaks. They claim up to 100 psi! Very responsive as well.

 

I've got nothing but good things to say about the tial q I was using.