Exhaust options

[964rh]

Hi

What exhaust options are available for a 964?

At present I am running cat bypass with a g pipe, and whilst I love the noise it makes decibel meters don't.

I am gradually being pulled in to the trackday thing but at the min. would struggle to get on most tracks. I got told to back off at an airfield when I measured 107db

I don't really want to go back to standard. Is there a system that gives the growl that is db friendly?

Any suggestions?

Rob

 

[Dave Wilkinson]

Rob,

I suspect you are not alone!! I'm pretty sure you will find that the majority of 964 owners who make a habit of doing track days will have either the standard 2 silencer set-up or have a Cup pipe (primary bypass) and the standard final silencer. I think the G-Pipe creates more noise because it removes the most effective part of the silencer system - the final box. I can't remember if you still have your final box - I have a suspicion I recall you selling it - but I fear it may be the only solution.

I can't recall ever seeing an aftermarket system that was designed to be quiet!! You know what my Fabspeed sounds like!!

Best regards

Dave

 

[964rh]

Might give this a go Dave, thanks. I've still got the sec. silencer.

Anyone got one to get rid of? cheap?

Rob

 

[John H]

Anyone tried the Haywood and Scott one piece silencer that they are advertising in some of the mags? Appears to replece both primary and secondary with one stainlees steel silecncer and tail pipe. Looks neat too.

JH

 

[OllieW]

Rob

I am runnning a cat bypass and primary silencer bypass on my RS, but still have the final silencer fitted, and touch wood to date I have not had a problem on track days both here and abroad.

Compared to other 911's my car is pretty quiet when it needs to be, but has a great growl at high engine speeds.

Speak to Chris at GCR and see if he knows of any secondary silencers that are going spare.

Regards

Ollie

 

[Dave Wilkinson]

ORIGINAL: John H

Anyone tried the Haywood and Scott one piece silencer that they are advertising in some of the mags? Appears to replece both primary and secondary with one stainlees steel silecncer and tail pipe. Looks neat too.

JH

John,
To the best of my knowledge, Garry Steele has an H&S system on his 964. It's [FONT=arial"]LOUD.
Back in 2004 we had a little informal "noise" competition between his car and mine - with a Fabspeed dual outlet single silencer system. He won!!!

I don't know if Garry's is the same system as is being currently advertised but I'm pretty sure it was a Heywood & Scott system. If Garry reads this maybe he can confirm.

Regards

Dave

 

[John H]

ORIGINAL: Computamedic

ORIGINAL: John H

Anyone tried the Haywood and Scott one piece silencer that they are advertising in some of the mags?

John,
To the best of my knowledge, Garry Steele has an H&S system on his 964. It's LOUD.

Ah, in which case I shall leave it alone as I don't want to make my car any louder than it is. I am running a cat by-pass, a cup pipe and a regular secondary silencer, and I reckon it is a good set up. Deep throatly idle, surprisingly civilised at light throttle which makes for good cruising, but a real bellow at full beans.

JH

 

[Jamie Summers]

John,
I have the same set up as you, with an open airbox with K&N. Whilst it does sound great the problem is that it reads about 105-106 db in a static noise test, so lots of tracks won't let you play. If you never intend to track then this is not an issue, but many people end up just going back to the standard primary silencer to get under the noise limits.

That said, within reason H&S will produce anything you want (at a price), so if you want a full equal length header with heat exchangers, de-cat and single out back-box, with a 98db static output (as I do !!!), then they should be able to do it ! (I hope). If a few people were interested in this kind of set-up I expect they might be open to a bit of price flexibility ??????

Jamie

 

[John H]

I have no intention of ever going near a track (other than to spectate) so the noise limit is not an issue for me. I just liked the look of that H&S exhaust that's all.

With the set up I've got, the car doesn't sound too loud from inside, but I was driving my pal's Boxster with the top down as he came past me in my car at full chat in 3rd, and I was astonished at how loud it was from outside. []

John H

 

[Melv]

I've managed to get the Cup Car down to about 100db on static with:

K&N Filter;
100 Cell Race Cat;
Primary silencer(under the back bumper);
Final Silencer(offside rear wing);
Conventional tailpipe.

Just replacing the Cup Pipe with the primary silencer took about 5db off, with barely any noticeable reduction in ooomph below 4200rpm. Only drawback is that it doesn't pop and bang on the over run anymore!![]

I have a silencer to replace the tailpipe from Merlin at Combe if I'm marginal, that takes about 2db off.

 

[Guest]

Dave,

To the best of my knowledge, Garry Steele has an H&S system on his 964. It's LOUD.
Back in 2004 we had a little informal "noise" competition between his car and mine - with a Fabspeed dual outlet single silencer system. He won!!!

This isn't correct!

I have the trophy to prove that I won - with a cup by-pass.

Steve

 

[Dave Wilkinson]

ORIGINAL: steve bright

This isn't correct!

I have the trophy to prove that I won - with a cup by-pass.

Steve

Steve,

I don't doubt what you say. The occasion I was thinking about was at the R15 Concours event at the Dart River Adventure Park in June 2004. I could have swore that it was Garry Steele with the H&S exhaust. I know John Miles was trying to egg us both on!! I'd be very surprised if a Cup Pipe car would be louder than the H&S system - unless it had a G Pipe too!!

Regards

Dave

 

[Guest]

We are definitely talking about the same event - and after you and Garry had your sound-off from either side of the field I demo'd mine on it's own. The trophy however was awarded for the "best sounding 964" and not necessarily the loudest!

Mine has been measured at a trackday at 104.9dba stationary holding 5000rpm. Not bad for 105 dba limit for the track I thought!

Steve

 

[graham harvey]

I have the following on mine ;

De-cat Pipe
Cup Silencer
Standard Final Box

... if I replaced the final box with a G Pipe would this result in a loss of power ?

 

[Dave Wilkinson]

ORIGINAL: graham harvey

... if I replaced the final box with a G Pipe would this result in a loss of power ?

Graham,

It would certainly wake your neighbours up!! With your present setup the only component which aids the "silencing" is the final silencer. If you remove that and replace with a G Pipe you will have no silencing at all!! It will be a completely open pipe from exhaust port to tail pipe. It won't do a great deal for the back pressure, likely to lose you a few BHP and guaranteed to lose you some neighbours into the bargain.

ORIGINAL: steve bright
The trophy however was awarded for the "best sounding 964" and not necessarily the loudest!
Steve

Steve,

I'm sorry I didn't recall that bit. Ken was pretty determined to make sure everyone got an award - I think mine was for the "Most Modified".

Regards

Dave

 

[graham harvey]

Thanks Dave. I thought that no back pressure would result in a loss but I just wanted to check. I think the neighbours would also appreciate if it was left on !!

 

[chrism964]

I have e-mailed H&S about exhaust options for 964's. I didn't ask about noise levels I'm afraid but did get a price list (which always focuses the mind!)
This is their reply (correct at time of enquiry 6/1/6)

[FONT=courier new"]Equal length headers/heat exchangers with a twin outlet sports exhaust giving approximately 15 - 20 bhp (see John Tiplers report in May 2001 issue of 911 & Porsche World) at a cost of £1600.

The cheaper route is single outlet back box at £325
twin outlet back box at £450
Pre silencer at £195
Pre silencer replacement pipe at £150
crossover pipe at £150

All prices are exclusive of delivery/fitting & VAT.

If you need any more information please do not hesitate to contact us.

HTH

Chris

 

[John H]

I suspect that the one I saw advertised is the single outlet back box, which seems quite reasonably priced at £325.

[]

 

[John H]

There is a 964 primary silencer on UK ebay right now, item no 4606596728

John H

 

[911SSC]

I have various second hand 964 exhausts laying around that we ( Hayward and Scott ) have removed which i'm sure we could do a deal on [] .

Ian