i installed a helix uppipe the other day, was pretty hard, and i got it on and went for a test drive and i could definatly feel a difference, but i heard a sound that i havent ever heard before. like almost like a fluttering sound, it isnt all that high pitched, but it was kinda alarming when i heard it. so could this be wastegate flutter or something else? i just redid the install tonight just to make sure i didnt miss something the first time around, and i heard the sound again. so yea, thanks for any replies.

i did try posting this same query in the wrx forum, but it wasnt too well taken, thought i might get some more answers here from local people

 

That is totally normal. When I did mine, I thought the same thing you did, but it is normal. All my friends with uppipes on their wrx's make that sound. I believe it is the turbo.

 

cool, thanks but now i really do have a leak, and i know its a leak for sure so that sucks but thank you though for your reply

 

Where is the leak and how can you tell?

 

i hear a high pitched sound, that is almost like a bird, around 3000 rpms before turbo and engine drown out the sound, gonna take it all apart again and replace the gaskets to be on the safe side probably, and get a new downpipe since i'll be doing all that work for the third time.

 

Whats the WG arm turn trick?

 

that noise you're talking about is the increase in turbo spool. usually when ur uppipe is catless u can hear it "whine" more...thats all it should be..im hoping