I installed the HD TCV on my '98 V70 T-5M and could see a significant difference. However, I must tell you that I installed at the same time the Short Ram Intake and MSD Ingnition Coil Upgrade. In addition, I did the ECU upgrade and installed the cat back Sport Muffler some years ago.
So, with all of that, the car was already quite spry, but I could see from the boost gauge that boost was commencing at a lower RPM (2.0K - 2.5K RPM vice 3.0K RPM) and increased much more rapidly. On the IPD customer feedback for the TCV, I said that it felt like my car had been cured of asthma.
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