The Defector

So winter in Cincinatti and can't take out the car so fixing things and looking at stuff on the Internet. I've noticed that a lot of 997's have turbos you can hear whine, pretty loud as a matter of fact. Mine are VERY quiet. I can't imagine they did something just to make the turbos whine louder so what gives????

BTW, mine is stock except a two can Tubi exhaust. Besides sounding better after the "new" exhaust, turbos sound the same.
JC

TypeRx

When I purchased my car, it had a Kline exhaust and Fabspeed intake. The in-cabin symphony was awesome and had tons of turbo spool and recirculation noise. I recently reverted to a stock setup and now I really hear very little turbo...much more engine and exhaust.

PS: I am selling the Fabspeed setup - I wanted OEM reliability.

El Dario Loco

I have a Cargraphic loud exhaust with muffler by-pass valves and when they are open the turbo spool-sound is very noticeable, not so much otherwise.

MK_TT

also, spool sounds are more prevalent with a catless exhaust

Dennis C

I don't notice it too much on my stock turbo either. I occasionally hear it when going through a tunnel or driving close to a barrier. The most prevalent sound during acceleration is induction noise.

Yogi911

I agree. It may be "ricer" but one of my favorite parts of turbo cars is spool noise and recirc/bov valve noise. Unfortunately my 997 has neither. One thing i am envious of on the 996 and makes me miss my wrxs and dsms of days gone by.

The Defector

So it would seem that the common thread for the turbo whine is a big decrease in exhaust backpressure.

Also I'm not the only wwho likes that sound...

JC

triplenet

I have a GMG with cats ... the turbo whistle sounds great - remove the cats and it gets better ...