I went to 4Induction in Maryland to chip my car today with GIAC X the guys are very nice and they told me I don't need the N75 Race Valve because It is no diference for my car, it only help for VW.
I don't think so but I don't know too much about it.

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it will raise ur boost 1-2 psi through out the revs

 

and smooth the boost curve and remove the spikes..... it will help and you will feel the difference

 

Thank's

 

its a test and see kinda mod cause it can also boost too high and cause ur car to go into limp mode....thats why some shops dont wanna try it.

 

yea its kinda hit or miss, so far i have seen more people with it working fine then with it sending the car in to limp mode