i'm just wondering that how was the Greddy Profec A ?
not the profec B

i know its old.but my friend give me for free
so i'm just wondering that if its good to install in WRX?and how to tune ?thanx very much :)

One of the mags did a boost controller comparo a while back. The profec a scored lower than an mbc.

so its not that good ?

to quote them, they said it is no better than a ball valve.

click here to read (http://www.sportcompactcarweb.com/tech/0207scc_boostcontrol04/)

thanx for the info :)