964 exhaust and heat exchangers

Guest · May 28, 2006

I'm in the process of looking at changing the exhaust on my 964 C2, first question is does anyone have any recomendations on a system, cost, where to buy etc:, and second questions is does anyone know if there is a special tool to remove the nuts holding the exchangers to the heads ?
Thanks
Peter

964rh · May 29, 2006

Peter

Depends on your budget, not much £££ may be benificial looking at Euro Car Parts who do a fair bit of Dansk exhaust parts for a 964.

For loads of £££ have a word with Hayward and Scott, seen a few of their stainless systems and they look and sound really nice. they are forum users, user name 911SSC.

Can't help with the special tool question tho'

Regards

Rob

Guest · May 29, 2006

Hi Rob,

I'm found the special tool, a snap-on universal socket, basically a universal joint with a built in socket, part number FSUM13 in case anyone else needs to know.

Thanks re the exhaust.
Peter

Jeff Forsyth · Jun 3, 2006

Be careful removing the heat exchangers. If they havn't been off for a while, the studs can snap. It happened to me when I had to replace the metal 90 degree oil pipe that goes into the engine. It's often a good idea to replace them anyway.

Sincerely

Guest · Jun 3, 2006

Hi Jeff,

I've had one snap, which I think is not too bad. I will change all the studs for new ones and fit new oil pipes also.

I also have a 1966 2.0 911, I changed the complete exhaust/heat exchanger system for a nice polished stainless one, I had to drill out 4 studs on that bugger, half the trick is taking your time and not trying to rush it. Does look nice now though !

Peter

Jeff Forsyth · Jun 3, 2006

Best luck Peter, where are you based ?. I do fancy a stainless system myself i.e. Hayward & Scott, I wonder how the exhaust note would change. Any piccies ?

Sincerely

Guest · Jun 4, 2006

Hi Jeff,

I'm in Suffolk, I don't have any piccies but I guess I can take some, not for a week cos' I'm in Tokyo now.

Cheers
Peter

Guest · Jun 10, 2006

I intend to junk the cat on my car and fit a cat-replacement, the replacement pipe has a boss for the sensor, now the next bit.

There seems to be various options from there on, I could junk the rear silencer that runs along the back of the car and also fit a G pipe to bypass the final silencer.

If I do all of this basically there will be no silencing of the car at all, will it be too loud and would I have to re-map anything ?

What are my options ? I could re-fit the standard silencers, boring. I was thinking of retaining the rear silencer and just fit a G pipe to bypass the final silencer, or would I be better to keep the final silencer and bypass the rear silencer with a cup pipe ?

Suggestions please.

Jeff, I'll take some piccies and post them here of the stainless system I fitted to the 1966 car.

Thanks
Peter

Dave Wilkinson · Jun 10, 2006

Peter,

From my experience and a summary of the perceived wisdom of the forums:

Cat bypass = good move if pre '92 car. Slight power benefit, slight noise increase.
Cup Pipe = Slightly more power benefit, good noise, weight benefit too.
G Pipe = Not as much power benefit as Cup Pipe, more weight benefit , easier to fit, different but still good noise.

All 3 = no way, unless on a (very tolerant) track. Another alternative is to junk the lot and replace with a completely new system. There are lots about from Fabspeed (like mine), Hayward and Scott, GHL, etc. etc.

You don't have to re-map anything although most re-maps will benefit from a freer exhaust and induction.

Hope that helps.

Regards

Dave

Guest · Jun 10, 2006

Hi Dave,

Sounds good to me, cat-bypass, cup pipe, and retain the final silencer. My car is a 1990 on a 'H' plate, so no problems losing the cat.

I'd like to junk the lot but to be honest I'd rather spend the extra on paintwork, etc:

Thanks
Peter

John H · Jun 10, 2006

ORIGINAL: peterlydford

Hi Dave,

Sounds good to me, cat-bypass, cup pipe, and retain the final silencer. My car is a 1990 on a 'H' plate, so no problems losing the cat.

I'd like to junk the lot but to be honest I'd rather spend the extra on paintwork, etc:

Thanks
Peter

That is the same set up as my car (I bought it that way) and it sounds fabulous.

JH

Jeff Forsyth · Jun 15, 2006

Dave, I couldnt of put it better myself.

Peter- I went for the Cup pipe myself, and ditched the primary muffler (the mufler at the rear), but the cat is in place but with the oxygen sensor would seem to be capped off. The sound is pure bliss. However, the vehicle runs a RUF ECU control unit and RSR chip.

Mjonzo · Jun 16, 2006

Going for the cup pipe Primary muffler bypass myself this weekend. Will fit a K&N filter at the same time and cant wait for the improved sounds and breathing.

Mjonzo · Jun 26, 2006

Fitted the cup pipe (primary muffler bypass) at the weekend. The sound is a massive improvement over the slightly disapointing standard exhaust note. The flat six sounds awesome now and gives the car a real 'race car rasp'. It makes the hairs stand on end and widens the grin !
I was a little concerned about it becoming too loud as i wanted to use the car for some european touring later on, but with the windows shut or at cruising speed the sound levels are perfectly acceptable.
If anyone wants to hear it before making any exhaust mod decisions i would always be happy to demonstrate or email a mpeg off when i get the chance.

Guest · Jun 26, 2006

Sound like it's the way to go. Has anyone ever just fitted a G pipe in place of the final silencer and kept the silencer behind the bumper, how is that ?
Thanks
Peter

Mjonzo · Jun 26, 2006

Peter, you need to go to this link to hear the alternative exhaust sounds you can get from different silencer combos. I found it invaluable when deciding whether to go for a primary or a secondary bypass.
http://members.rennlist.com/greg_l/964ex.htm

the problem i think (from what i have read) is you get more rumble/drone from the g-pipe secondary bypass, so could be a factor if you intend to do long journeys and/or dont want to annoy the missus ;-)
I am extremely happy with the cup pipe. It was also a doddle to fit (under an hour) and weighs about a fifth of the weight of the silencer that it replaces...all helps with that power to weight ratio !
cheers
Mark

kmdavis · Jul 5, 2006

I have removed the across car silencer and fitted a cup pipe the rest is standard,. the sound is fantastic, cant help but drive with the window open all the time, bar motorways. The cup pipe cost me £100 second hand from a seller on piston heads. Porsche- a- Part sell them new for £199.
The cup pipe is stainless, its in such a protected area that you do not get any rust and it is a straight swap. Make sure you recieve the fitting straps. Oh I did have to add a few nails in the house windows to stop any ratles.

38F3E1 · Jul 6, 2006

Curious about any opinions on the difference in sound between the G-Pipe mod and the Cup Pipe mod. Not the loudness difference but the difference in the deepness of the sound.

My car has the G-Pipe mod (with cat delete as well I believe) and the sound is really deep. Sounds almost like a typical large capacity V8 - sort of burbles away at tick over. I am more used to the 'snarling angry wasp rasp' of older Porsches like my E and wondered if the Cup Pipe mod gets nearer to this sound?

Ian.

964rh · Jul 6, 2006

Ian

I had a g pipe ( and cat bypass) on my car at Curborough and wouldn't have got through the noise test had I revved up to the full 4500 rpm, (only took it up to 3000 but still registered 104.5 but I loved the 'burble' it had and didn't really want to lose that.

Since then, I've put a cup pipe on and the sound is indeed a lot raspier (if thats a word), crisper and nowhere near as loud.

To me you seem to get a sharper sound to it at idle, and on hard acceleration it's great. I should have done it a lot sooner.
If your passing GCR, my cars still in there till early next week I think, get Chris to start it up and have a listen.

Rob