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So I recently installed the GFBDV plus for my n20 WITHOUT the stiffer spring so it could be more OEM like and so I wouldn't get the fluttering noise while maintaining the benefits of not having a plastic dv valve. Is it normal for the car to make fluttering noises even without the stiffer spring ? Is this compressor surge ? Also the guy who installed it told me he had to drain the coolant to install it which I call bs but idk I wasn't going to argue. Any ideas what this could be ? I swore you only got the fluttering noise if you installed the stiffer spring.
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