oy!
first check all your silicone on your intake and hardpipe(where the tubes connect). if all is well, next thing to check is your bov and wga. if the spring is bad, your bov will not shut all the way and here you get your whistle. does it change pitch the higher your rpms? if you bought a bov on ebay for 20 bucks, get the EFF rid of it and invest in turbonetics or hks or something with a brand name on it. if your good there too, spray some bereak cleen around your manifold because a bad manifold gasket is also a likely cause. all of these are easy fixes though. highly doubt its your break booster.
1. make sure intake is air tight EVERYWHERE
2. WGA and BOV are good
3. Manifold gasket(worst case)
good luck bro. let me know whats up
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