pretty sure the 225 DV is the same as the 150. either way both fail prematurely.
your biggest gains will be through a remap. On a 150bhp 20vt 210bhp will pretty much be the limit. Plus the cost of a remap will be near enough the same as an exhaust system anyway.
I had a 20vt lump in my mk2 golf which I'd had installed at around 200bhp and the full exhaust system didn't really increase my power much, but it did make it all work nicer and smoother.
I fitted a Bailey DV and my woosh turned into a chatter on shifting lol. I don't think you hear much of the DV if you still have the standard airbox on there as this muffles the sound. (I never had a airbox so can't comment from experience)
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