i finnnnnnnnally got my intercooler installed this past few weeks and i can definately notice the gain in power. however, coming out of my intake after i let off the gas(BOV works normally) i get aFLUTTERING sound. i cannot figure out what this is. my intake is just 3 inch pipe going to a stub K and N cone filter at the end. here are some pics of my install

http://img139.imageshack.us/img139/3748/p1010134ry2.jpg
http://img412.imageshack.us/img412/9839/p1010137hp0.jpg

 

hey,
I have the same noise on mine but it only does it once in a while and I dont have a intercooler on mine. but it doesnt seem to be doing any damage.
Dave