Josh Bell

So I just got a 2008 g37 sport coupe on Monday, loving it so far. The only thing I have noticed is when I'm either parked or just idling there is s rattling sound from near the mufflers. It sounds a little different from the exhaust rattle videos I've seen and goes away when I rev the engine as well. Is this how it starts or could it be something else?

hurleyguys

if it happens at idle. i would just idle the car and take a look down there to see what is happening. it could be an exhaust hanger is loose or maybe a heat shield is loose or hitting something.

Josh Bell

So apparently it's inside the muffler. Washed my car today and a buddy of mine checked it out. Any idea of what it could be?

NealP

Maybe a rock or pebble got in there?

Anon

I have a similar problem with my 2008 G37s and a very knowledgeable Service Rep said it was a loose baffle in the muffler. A new muffler is very expensive so he suggested just living with it.

PNW_IPL

iTrader: (5)

There's a recall or tsb on 08 mufflers coming apart inside...

ILM-NC G37S

iTrader: (3)

Just about all 2008's had the rattle in the muffler. The baffles were improperly welded and literally just popped apart. There was a TSB regarding this which called for replacing the muffler. For a 10 year old car the best bet is to just:

a) deal with it;
b) replace it with a new OEM for around $700;
c) replace it with a newer/used from eBay for around $200, or;
d) upgrade the exhaust entirely.

Anon

Thank you for the information.


I have been living with it but am wondering if the loose baffles can move, restrict the exhaust flow, and reduce performance.

kroy

I would either buy a used OEM if you want to keep stock. Check for sale section here and also ebay.

Or just get an aftermarket. i don't think you need a full CBE so just get an axelback. If you live in a dry area, just get a topspeed. It's only $300.

AmongU