Just got a TurboXS stealthback/Prodrive axleback. The exhaust note is nice and low, but when I get on the throttle, I hear a pronounced chirping sound, even before I get to 3K RPMS and the turbo starts really going. I can even hear it at idle, albeit not that loud.

Any ideas?

 

Turbo spool or wastegate flutter will both be much louder with a tbe. If you don't think its normal then you probably have an exhaust leak. I would reccomend listening to another car that has a tbe and compare the sounds.

 

I heard a couple sharp rapping noises before I first noticed the noise. I also thought that it wasn't pulling as hard, but I chalked it up to my imagination. Now I've also noticed a wooshing noise (like wind) when I get over 3000 RPMs.

Sounds like a visit to an exhaust shop in my future.

 

maybe its your tires chirping because your wrx is mad fast now yo! lol jk

you might have an exhaust leak... usually is after you install an exhaust and it flutters like that.

 

I have the TXS tbe, and if you are describing the 'tea kettle whistle' then its normal. The huge downpipe causes turbulence resulting in the whistle.

If its a metallic screech or chirp, it may not be installed/fitting correctly. Im in the east bay if you want to hear mine.

 

That's exactly what it sounds like, thanks. I won't worry so much

 

Yeah, I love that sound. Whenever I take someone for a drive in my car, they always say "Whoa, your car sounds crazy!" Sure beats an intake/bov for a noise maker..lol

 

I don't get a chirp with my APS downpipe/turboback, but I definitely get a WHOOSH under the passenger-side floorboards when I gun it, right as the turbo spools up. 3" exhaust is no joke! I've ridden in a friend's car which has a vf34 upgrade running 22psi of boost, and when he hits 3500 RPM the sound is like a vacuum cleaner (his APS CAI whooshing from the front, APS downpipe whooshing from the back of the engine!).