My isf is make this strange noise, only under full throttle excelleration. The car drive just fine under normal driving ie.. around town and on the freeway. However when I give it full gas and the secondary intakes open there is this strange noise. Not sure if it the Transmission, motor or the exhaust system. My car is a 2008 and fully stock. I took it a Lexus dealer in Tustin ca. and the service guy drove the car and heard the noise but did not know what it was. Too hard to pinpoint. He is a ISF owner as well. Any help here would be great.

 

make a video with the noise

just describing it as noise doesnt really help us help u

 

Try chassis ears

 

It maybe your drive belt, Joez mentioned to me last time i met him . The wooshing , wooshing sounds ? how many miles on the F ? Joez just recently replaced the drive belt and the wooshing sounds are gone . ?Hope that help furthermore u can ask Joez for more info.

 

I will make a video and post. Took the car to make the video and of course, no noise. It seems to happen about 70% of the time and I almost know with start up if it will do it.