engine emits a different roar at higher RPM

[porsche996tt_tpe]

Just noticed that the engine starts to emit a deeper roar (where it wasn't like that before) when accel at around 3000RPM. But holding at high RPM without acceleration the engine sound seems normal. What could be wrong?

Thanks!

CW

[wross996TT]

First you need to tell us what car you have MY, model, etc. Then do you have any mods?

[porsche996tt_tpe]

sorry about that... it's 2002 996 turbo, unmodified. The car runs fine, just this deepr roar when pushed... from the exhaust perhaps?

[porsche996tt_tpe]

this happens when boost is greater than .2 or .3

[wross996TT]

Most folks would be happy with a deeper roar. Read any possible codes, but possible explanations (DV's, leaks) would likely affect performance as well.

[porsche996tt_tpe]

Well, after a few days at the garage, it turns out it's the Y-shape rubber part that connects to the two turbos with a smaller tube-like structure sticking out, near the top of the "Y". I think this part leads to the turbines. The smaller tube is what's leaking. The part was replaced and car runs really well! The turbo's build up really fast. Cost me $100, with free labor, because I'm helping my mechanic friend on the Vapor Recovery System on the 997 4s. ha.