I bought an Evo 8 with a Greddy S blow off valve. I removed the BOV and put on an Evo 9 stock diverter.

Is it my imagination, or does the car seem a little less powerful now on the top end.
Does the Greddy BOV give a power increase?

 

haha i dont post much here....usually just look around but wow...

 

Its your imagination.

 

wow

 

... that's what I thought...

 

The greddy just sounds faster!

 

...ok ....ok
Stop with the wow.
I get the message...

 

I'll trade you my Evo 9 BOV for it!

 

it may feel weak if the 9 dv is leak badly at high boost. how is your boost curve? still the same as before? just to be safe do a boost leak test.

 

the greddy gives you 25whp and 7 tq...holla

 

If your greddy bov was tighten all of the way, it could have helped you hold more boost at high rpms. I have heard the jdm diverter holds boost pretty well but I have been pretty satisfied with my greddy.

 

the evo9 could be opening up early too.

 

True. Try the crush mod.