Exhaust Booming

[Will Eastman 6]

Have owned my gti (1.6) for about two weeks now n an annoyance i have is that when cruising at about 50-70 the exhauster makes a really booming sound. Is this a common problem or is this just "a gti" by buying a different back box will i be able to get rid of this cruising sound or will it make it worse/louder.

thanks

[Anthony 1,003]

What exhaust is currently fitted?

 

Many aftermarket "uprated" systems boom terribly around 3000-4000rpm, as can standard if the backbox baffles are shot.

[Will Eastman 6]

It just looks like a standard one, defiantly nothing fancy n sporty. So do you think a new backbox may stop this?

[Masekwm 2]

I had an off the shelf replacement from GSF, made by Bosal, and it made the car so loud it was horrible.

[Anthony 1,003]

It just looks like a standard one, defiantly nothing fancy n sporty. So do you think a new backbox may stop this?

If the baffles are shot on the existing one, yes.

 

However, this might sound stupid but have you driven other 205's with healthy exhausts? They're not whisper quiet luxobarges by any stretch of the imagination and there is a degree of boom/drone there regardless around the speeds that you're talking - this just tends to get much worse with knackered baffles or with a wickid-yo 4" japspec exhaust hanging off the back.

 

Having the car stripped out and missing the sound deadening and rear seats and/or parcel shelf doesn't help either.

 

I had an off the shelf replacement from GSF, made by Bosal, and it made the car so loud it was horrible.

Bosal are normally alright, so I'm surprised that it was that bad

[monkee87 2]

GTi's are usually loud at motorway speeds. I found that putting sound deadening back under the boot carpet helps alot. Also if your spare wheel is present that helps alot too. If that fails, put some sound proofing behind the rear door cards too.

 

Being a small car, the back box is close to the driver..

[Simes 248 2 Cars]

I found installing a sub and a couple of amps to compliment the headunit (quality not volume) drowns out the exhaust at motorway speeds!

[feb 47]

In my first 1.0 Trio Plus the exhaust was found to be rusty during a MOT and had to be replaced. The new backbox (from Halfrauds IIRC ) that looked identical to the OE one was really boomy and gave me a headache when driving the car.

[Tom Fenton 1,548]

I've also had replacement backboxes a couple of times now on different 205's that were really too loud. Sadly its a bit of a lottery unless you buy a genuine Peugeot one, will be expensive though, if they are still available even?

[matt.f 16]

Walker exhausts ate normally good quality

[bondo 6]

I need to replace the centre section on a 1990 1.6 GTI. I have decided to do the back box as well. Looking about I can get all the bits from Buypartsby for £126.86 deliverd. This is for a Klarius exhaust (was Meritor/Timax/Arvin).

 

Anyone got any comments re quality?

 

Secondly, It looks like I can access the bolts where it connects to the manifold from the engine bay if I take the air filter box off. Is this the best way to do it?

 

There is a fitting kit with a mesh type gasket at the manifold connection -presumably I don't need to use paste as well?

 

I am intending to take it all off as one bit (backbox and all) build the new one up on the ground and then install as one unit. Is this doable or has anyone any tips?

[bondo 6]

I've also had replacement backboxes a couple of times now on different 205's that were really too loud. Sadly its a bit of a lottery unless you buy a genuine Peugeot one, will be expensive though, if they are still available even?

 

No they are 'NFP' which I take to mean 'No Further Production'.

 

If they were available I am certain they would cost a large fortune.

[Anthony 1,003]

Actually, the backbox alone was surprisingly reasonable from Peugeot.

 

Phase 2 non-CAT 1.6/1.9 GTi (172650) = £94.63 inc VAT

Phase 2 CAT 1.9 GTi (172634) = £88.13 inc VAT

 

As above, the non-CAT backbox is listed as NFP, but the CAT backbox is listed as still available.

[shalmaneser 26]

My GTI-6 is pretty noisy, and I'd like to quieten it down a bit just to make motorways more bearable! Does heat wrap have any effect on noise, I'm thinking it might reduce the reverberation of the exhaust itself?

 

Although removing the massive ECU cabling hole in the firewall by my feet would be a good start!

[Anthony 1,003]

Although removing the massive ECU cabling hole in the firewall by my feet would be a good start!

That hole not being sealed up allows in a massive amount of engine and road noise regardless of exhaust or anything else. Seal that up first and foremost and go from there.

[bondo 6]

Well I have just finished changing the two-part exhaust on a standard 8 valve phase 2 1.6GTi. I must say that on first reflections it's only two bolts at the manifold (with all the washers and springs and stuff) three rubber bands and a clamp. So about 2 hours - wrong!

 

This is the worst job I have ever carried out on a car. Removing one corroded and stripped (bent after I had had a real go at it) bolt from the manifold took me 5 hours.

 

Then I find that because the manifold is in the way you need to put the new bolt in a 'swivel cup' affair. BUT you have to replace the bolt and the cup as the bolt won't go in on its own due to the design of the manifold. Loads of hacksaw later - you can't even get a mini-grinder in there and it's gone. So all new fittings - great.

 

Then spend an hour teasing the old cone gasket off the manifold and finding that the new one is VERY much a tight fit.

 

Then having got it all on I find there is a crack in the manifold. Later type manifold with the bracing. I REALLY didn't want to replace it so I filled the crack with High Temperature sealant and fitted a large jubilee clip around it to hold it in. Amazingly it works fine.

 

Then I installed the backbox and all was good- until I road -tested it. The centre box was hitting on the body as it is too high. It only bangs in reverse and when you start/kill the engine, not when you are driving or going over bumps.

so I buggered around with the backbox clamp,loosened off the manifold bolts etc but no improvement.

 

I got on my bike and went down the pub. When I came back I was so pissed off with it I got a long bar and bent the middle section down.

 

The result is that it is on, there are no blows and it sounds amazing - possibly a bit loud but in a good way. My understanding is that as the exhaust gets coked up a bit it will quiet down, but that doesn't really matter.

 

NOT a two hour job.

[Simes 248 2 Cars]

Yep, aren't exhausts the best things to work on, especially without a ramp.

[bondo 6]

Yep, aren't exhausts the best things to work on, especially without a ramp.

 

Know what, I reckon you could change the whole exhaust system on a standard GTi without even jacking it up.

Edited May 22, 2011 by bondo