I recently installed a IPD Plenum and charge y pipe on my 991.1 Turbo S. Directly after install I have this slight chirping sound. It is not constant but sporadic. Not under throttle or at idle. If cruising at a set mph it comes and goes, on off on off. Any insight would be greatly appreciated. It's very annoying.

 

Just a guess, but have you tried doing a pressure test to see if maybe it is a slight leak?

 

I'd be looking for parts making contact/rubbing.

 

Were both rubber bushing intact that the y-pipe is snapped into? Can you open the deck and and grab the y-pipe and move/shake to reproduce the noise/chirp?

 

As a matter of fact one of the y pipe bushings broke off (passenger side). I will try to move the y pipe to see if I can get it to chirp. That sounds like it coild possibly be the problem. Thanks everyone for all your input.

 

It’s the way it’s designed you get like a low pitch noise when you give a lil throttle

 

I see, but its more like a higher pitch chirping and can be longer chirp at times. I don't know what else it could be.

 

I recently added the same modifications on my 991.1 TTS and am getting the same chirping.

Took it to my shop, they went back in and checked their work (inspecting seals, couplers, connections) and concluded this is the nature of the beast sometimes with these mods. Naturally I’m still looking for a solution because the chirp is indeed annoying.

Any luck finding a resolution? Any other ideas?