Alright long story short, when I go into boost and I reach a little over 4k rpms, the car sounds like crap. This is on the e85 pump map that I am using, when I previously ran the 92 pump gas map the car didnt make this wierd noise.

It sounds like when you blow on your mouth and you put your index finger on your mouth and go up and down very fast.

Again, this only happens when I put the car on boost past 4k rpms, if it's building boost or below 4k rpm it does not make this weird noise. I never exceeded past 5k rpm because I wanted someone to take a look at it first.

I am thinking it could be a tuning issue or maybe my injectors could be clogged up from the e85. I dont know, that's why I want to ask for opinions before tackling on this myself or bringing it to a mechanic.

 

did you have an external waste gate installed?