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Fist of all, absolutely get a new BOV first, I highly recommend the crushed 1g BOV, but I have the Greedy Type S and that works well also, plus it sounds cool. 
Second, what kind of boost are you seeing at the moment? The T-25 should not be taken past 15 psi, period, and preferrably should not peak past 14 psi, however i found that the lowest I can keep boost at is 15 psi with my current boost controller. A boost controller will be necessary eventually, esp. if you want to upgrade the turbo, but honestly, in my opinion, as long as you're around 14psi there's no need, as the T-25 is really difficult to control/keep boost down with. A good boost controller will help with creep, for some reason, even though thats more related to wastegate/O2 housing/downpipe. With K+N, exhaust, upper IC pipe, cut dump tube, and BOV, I was right around 15 PSI, and basically all my BC does is keep the creep down. So if that's where you're at right now, too, I highly reccommend just getting a BOV/Upper intercooler pipe.
Now, if you're at 12-13 psi with your current setup, a boost controller will enable you to hit 14-15 no problem, and you will feel a bit of gain... but I still reccommend going w/a BOV first..
Vandy
AIM toolshedmf if you have any more questions... ---------------------------------------
Black 98 GST missing her owner and looking for a new one...Inquiries welcome
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