Admiral Ackbar the 1st
You got fed a whole bunch of BS throughout that, to sell you something you don't need at all.Am looking at this as when i took my car into get a quote for my dwnpipe we got talking about the cobb air intake flutter....whisping in and out when on boost periodically...i was told the only way to get around the issue was to get a alchohol injection system(50/50 blue windshied washer fluid)....he said its the stock computer retuning the knock and adjusting the boost to compensate for the fuel detonation etc........even though its accessport tuned for the intake you can not get rid of the fludder....so am looking into this mod and wondering how many peeps are running it and any issues....he said it can be ran with 91 or 94 octane doesn't matter and will make the engine run cooler(of course because of the alchohol) and help the engine in the long run...anyone??
Wastegate flutter is just normal with these cars - some hear it better than others. It occurs very generally when you are at part throttle and low-mid RPM generally when the boost level is around the wasetgate spring pressure. It is just the wastegate flapping around sort of indecisively because being all the way open would produce more boost than the ecu is asking for and being all the way closed would produce too little. It is simply an annoying sound and not a problem at all.
Knock on the other hand is a serious issue with boosted cars. The ECU compensates for it by adjusting timing, unless you are at a really bad extreme where it can actually pull boost. You should follow Cobb's instruction video and do a log. POst the results in a public google doc and link them here. If you are getting knock, your car needs a physical correction (e.g. stopping an air leak between the MAF and turbo) or your map needs a modification to timing or fueling etc.
This whole "meth bandaid" stuff is straight BS. That is not the reason to run meth. Meth is for if you want more power from a car that is running correctly already. It allows more timing to be run, but it comes with serious risks on its own (e.g. running out of the stuff while doing a hard pull is instant death).