I have a Greddy Type S, has the spring mod. IMHO this is the best way to go. It holds more boost, up to 28 I think. and opens under way less vaccume. Stock BOV would open under 14HG or more, This modded Type S opens in as little as 8HG, so there is far less stubling and more seemless operation.

The MR would work as stock, maybe open a lil late as it is tighter but certianly not leak like the stock Plastic one.

 

Today I went to an open road and went to 150mph, I would say that my car performed equal or a little better. I would say that the MR BOV gives a better mid range torque.
OBS: NO ISSUES driveability like stock.


The MR would work as stock, maybe open a lil late as it is tighter but certianly not leak like the stock Plastic one.
Agree!!!