Exhaust nuts and bolts...

[BigLion]

Hi Gents

Getting my 997.2 exhaust mufflers 'Grundo hacked' - however all the nuts and bolts look absolutely rusted and seized !!!

Got someone coming out to take the nuts and bolts off, but I don't really want to reuse any so would like to take the opportunity to replace all the nuts and bolts across the exhaust system.

However I'm not sure what nuts and bolts I exactly need or where I can get them - is there a standard kit of nuts/bolts I can buy for example?

Thanks in advance

[Magic919]

Most Indies will replace them with stainless steel items. If you are unsure, then contact someone like Mike at Sports and Classic or Chris at ABP, as they have done plenty.

There is no 'R' in Gundo hack. Give the poor man the credit he deserves.

[YoungMD]

yes it's pretty amazing not sure what they made the exhaust screws out of but it seems slightly less durable than cardboard!

I replaced all of mine with stainless steel ones, which most people seems to do, the others ones seem to last a max of 5 years, but even after a couple of years they would probably round off if you tried to unscrew them.

I got mine from Design911, they have a stainless steel pack, not that cheapest but then design911 never really are, but good screws, they have them on ebay i think too. I also did a Gundo hack with a 1.75inch pass through, very nice, sounds great and no motorway boom noise, very happy with it.

[Trev450]

If you are going to the trouble of replacing the exhaust nuts/bolts, you should consider doing the manifold to head bolts too as they are made from similar rubbish steel.

[YoungMD]

I would say changing the manifold bolts would be very risky unless you need to, lightly one will need drilling out and then the fun starts

[Trev450]

You will almost certainly end up with a few flange bolts shearing, but these are a viable solution: http://www.timesert.com/

The alternative is your manifolds will eventually start blowing and in a worst-case scenario, fall off.

[burman]

Had the 6 bolts replaced on both exhaust flanges last year at Autostrasse as originals were just rust,. most had to be drilled out. Very high temps and salty water not a good mix.

[majordad]

Just wondering , would this be a good idea to do on a new or nearly new car , ie before they seize ?

[Trev450]

If you intend keeping the car indefinately then I would say yes. They are going to rust away eventually depending on how often the car is used, so it would be easier to replace them now before they start to deteriorate.

[Pugley]

One thing is for sure:-

If the bolts are rusty now, they will only become more difficult to remove as time goes on.

If you look online there are numerous suppliers of stainless nuts and bolts. You can buy more than you need for less than a fiver.

I can't fathom out why the manufacturer of such a "prestige" car skimps a few pennies on these particularly corrosion prone parts????

The exhaust and manifolds are stainless so why not the fixings

[Bumble SV]

I have the same issue noted for the last 12 months at service. I imagine SS replacement bolts would render the entire warranty void if I didn't replace with their super corrosive OEM ones! But it does make you think about replacing with a Hayward and Scott bypass pipe whilst you're at it...

[Trev450]

Pugley said:

I can't fathom out why the manufacturer of such a "prestige" car skimps a few pennies on these particularly corrosion prone parts????

Probably for the same reason they use mild steel and not stainless for the window regulators that rust and snap every five years or so!!

[BigLion]

Thanks gents - however I'm still no closer to knowing what I need !!!

I believe there are 5x M13 bolts and 1x M10 bolt which hold the muffler in place (so double up these numbers for 2 mufflers) - but not sure what length they are supposed to be????

Help!!!