I've got the RBV model # with 6 washers. Works fine, just remember to lube the outside of the cylinder before you put it in so it can easily slide up & down.
I have a MP5, and from what I've seen/heard from the BoV on the dyno, it's a good choice for the price. Mine was included with two different types of weldable flanges depending on what type of piping you're running as well too.
Picked up the TXS BOV last nite and installed it this morning. Install was a piece of cake took all of 10 min and 5 of those were reading the instructions carefully....
Its a hybrid BOV with part of the gasses being recirculated back into the car and part venting into the atmosphere. This keeps the MAF happy and stops any check engine light issues.. It comes with washers in case you need to adj the spring pressure but mine seems to be ok right out the box...
