997 Turbo Headers - Sound?

[therock88]

Hi all.....

I am just looking for opinions here....I installed some stainless T304 headers on my 997 Turbo. I checked for leaks, torqued carefully etc....When idling or running with no boost it sounds pretty much the same as before (maybe a little louder). When I accelerate and get boost...I can really hear the turbos (especially the driver side) spinning/whining. I checked with my mechanic at the dealer (over the phone) and he suggested with these headers you have bigger pipes, longer pipes potentially, and thinner steel than the heavy OEM headers. You have less back pressure and with the bigger opening and thinner steel would expect to hear the turbos more.

I just wanted to check here to see if anyone has any thoughts/experience to put my mind at ease a little. I do not think I created a leak, because it sounds fine until you see boost on the gauge..Then it sounds like a spinning whir, not like a ticking exhaust leak..

Thanks for any input!

DC

Edited April 10, 2011 by therock88

[Rotorbow]

I have the same sound on my 997 TT as well. It may also be caused by a high flow intake system as well...ie..Fab Speed cone style intakes without an airbox to

muffle the sound of the turbo's spooling.

[therock88]

I have the same sound on my 997 TT as well. It may also be caused by a high flow intake system as well...ie..Fab Speed cone style intakes without an airbox to

muffle the sound of the turbo's spooling.

Thanks for the feedback......I feel better now. I guess I should have taken the Porsche Mechanic's word anyway :)

I do have a BMC Filter and Headers, so guess that combo makes that interesting sound. Sounds a little funny at low speeds, but sounds like

a jet when it spools up at high rpms....

Take care,

DC