Boom boom GT3 991.2

[MARTIN993]

Exhaust woes...
Recently I’ve noticed a distinct change in sound of exhaust. (Stock 991.2 GT3). With valve open (above 4K revs), sound is esp. boomy.
I have the car booked in at OPC for a technician to look at it (or rather, listen to it). Wondering if anyone else has had this same issue?
Noise is louder, more muffled and boomier than usual. For avoidance of any doubt I’m aware that the exhaust tone on these cars is ‘boomy.’ This is boomier than the usual boom!

[Macca993]

Almost certain its simply the exgaist valve vaccume hose thats worked loose. Thus happens frequenctly on the 991 GT3/RS. You can put put your head under there and determine yourself. There is a circlip that holds it in place that usual goes AWOL once it works loose. Most of us on the track ended up using a small bit of bendy wire and securing it permanently on the 991.1 GT3. The heat at teh track doesnt help either as the silicon hose gets soft and is more prone to slip the nipple on the exhaust valve flange.

[MARTIN993]

That does sound likely, and great news it’s nothing more sinister. Let’s see if OPC have some bendy wire

[MARTIN993]

Macca993 said:

Almost certain its simply the exgaist valve vaccume hose thats worked loose. Thus happens frequenctly on the 991 GT3/RS. You can put put your head under there and determine yourself. There is a circlip that holds it in place that usual goes AWOL once it works loose. Most of us on the track ended up using a small bit of bendy wire and securing it permanently on the 991.1 GT3. The heat at teh track doesnt help either as the silicon hose gets soft and is more prone to slip the nipple on the exhaust valve flange.

[NBTBRV8]

One of my pipes came loose on the valve and it opens the entire system. Look under the back of the car for 2 round valves on the end of the muffler and see if the rubber hoses are still on.

[PSB1]

Macca993 said:

Almost certain its simply the exgaist valve vaccume hose thats worked loose. Thus happens frequenctly on the 991 GT3/RS. You can put put your head under there and determine yourself. There is a circlip that holds it in place that usual goes AWOL once it works loose. Most of us on the track ended up using a small bit of bendy wire and securing it permanently on the 991.1 GT3. The heat at teh track doesnt help either as the silicon hose gets soft and is more prone to slip the nipple on the exhaust valve flange.

Made me lol.