ive never noticed a difference in lag with and without a DV. all cars without a DV make the noise of compressor surge.
that wasnt his opinion, it was the results from a test he had done.
modern cars are fitted with recircs to keep the noise down.
i will continue to run without a DV untill i see tests that show quicker pickup with one than without.
theres also a few of my mates that dont use them and have never had a problem either.
i dnt see how you can notice loads of lag without, as without you already have boost pressure ready when you open the throttle, without it you need to build all the pressure up from atmospheric.
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