cup pipe or g-pipe...

[smallspeed]

Looking for a bit of advice... I would like to make my car a bit meatier sounding for the inevitable summer blasts, and am stuck between a cup and a g-pipe... I understand where each fits, however Im not 100% sure I understand which silencer does which (ie does the primary muffler do more work than the secondary or vice versa?)

my car currently has a cat bypass and a cone filter which sounds very nice, however I would like a little more beef, without inciting violence from the neighbours (Im OK with all of them at the moment, and can handle pissing a couple of them off on the odd occasion I get home after 10pm in the future as Im moving house in a couple of months)

Basically I dont want to sound like a clio with a 4" exhaust system, and so am looking for the next step on from where I am not, and not an un silenced race system!.. Im not sure whether its best to use a cup or g pipe for this, as Im not sure which silencer does most work. There was a web page a while ago with videos of 964's with different systems fitted, however I can't find it, and am also looking for a little practical advice from other owners too...

As I understand it the cup pipe has the added benefit of removing quite a lump of weight from the rearmost part of the car, so if its 6 of one and 1/2-doz the other, I will probably go this route...
All advice, experience and sugestions of the best people to purchase from appreciated

 

[964rh]

Smallspeed

I've had both...
G pipe gave me a sound not unlike a v8, grumbly and deep
Cup pipe gives a more raspy sound, more sports carish if you get my drift.

G pipe a lot louder tho' about 110db, cup about 105db.

Both installed with a cat bypass and drilled airbox.

Rob

 

[Steve Brookes]

I think both save about the same amount of weight as both the primary and final silencer are big lumps.

For me the G-pipe was too noisy and made me feel embaressed in certain situations so I put a standard silencer on. I also do trackdays which was another consideration. A strange side effect is that the car felt better balanced with a stock system which made me think that Porsche took into account the weight distribution of the exhaust system - cat on left, primary in the middle, final on the right. That's why if I go for a weight save I would keep the final and change the primary for a cup pipe to maintain the left/right balance.

I would also say (even though I have no data to back it up) that the car feels more responsive since taking off the g-pipe.

 

[smallspeed]

thanks for the responses guys... from what ive read "during saves" this morning the g-pipe is a bit noisy.. I think I might have a go with a cup pipe and see how I get on; I will do it before I get the car geo'ed in the summer, so hopefully the balance issue will be taken into account

ben

 

[38F3E1]

My car came fitted with a G-pipe from the previous owner. I intend to get rid of it when I get the time and fit a cup pipe as I think it's a nicer sound.

Ian.

 

[Hacki]

Agree with you guys, a cup pipe is the right choice. Had both, G pipe is just loud, nothing else, maybe too loud and a little like a rumpety rump V 8. Not like a 911.

Cup pipe should be combined with cup blackbox, that helps! []

Rgds

Hacki

 

[sbloxxy]

Ben,
If it helps, I had the sound measured on your car with the current set-up at a track day (Elvington)and recall that it was 101db.

Steve

 

[smallspeed]

[] 101!.. The neighbours seem fine with it right now so think I might invest in a cup pipe for the summer, and if I dont like it will replace the silencer again. Im guessing its a pain for long journeys and some tracks might frown upon it, so might look at make some quick release mountings (dzus fastners or similar) so it can be swapped out for the standard silencer relatively easilly, then making the connections is the only chore (reasonably easy thought I guess)

thanks for the responses guys

ben

 

[skendrick]

How much weight do the pipes save?

 

[38F3E1]

ORIGINAL: ian_uk

My car came fitted with a G-pipe from the previous owner. I intend to get rid of it when I get the time and fit a cup pipe as I think it's a nicer sound.

Ian.

And it just so happens a decent second hand final silencer has been aquired this week so my follow on question is ...

Best to use OEM cup pipe or aftermarket? And where is the best place to get the cup pipe from?

Ian.

 

[Dave Wilkinson]

ORIGINAL: skendrick

How much weight do the pipes save?

Steve,

The standard PRIMARY silencer (the one across the back of the car) weighs 23lbs amd the SECONDARY (behind the right rear wheel) weighs in at 20lbs. Bypasses typically weigh around 6lbs (Cup Pipe, primary bypass) and 2lbs (G-Pipe, secondary bypass).

Regards

Dave

 

[964porker]

Just fitted a sports swan neck G pipe by 'SCART', much larger than a normal G pipe and costs much more but gives a nice deep sound and improves the bhp by 12-15. The weight saving is 5.5kg

 

[skendrick]

On the subject of upgrades has anyone changed the ecu chip over with the Promaxsport chip and if so was there a noticable difference?

 

[kevin]

Lots of Promax talk on Rennlist, only conclusive talk is seat of the pants dyno, IIRC I havne't seen any proper dyno charts before and after yet.

Kevin.

 

[Dave Wilkinson]

ORIGINAL: skendrick

On the subject of upgrades has anyone changed the ecu chip over with the Promaxsport chip and if so was there a noticable difference?

I was one of the first to have the ProMax 964 chip and Andrew Sweetenham fitted it for me. I was astonished at the difference it made - not really in terms of sheer performance, although it IS better, but in the pure driveability of the car. It is so much smoother than it was with the standard chip and the idle is also better - even though many will maintain that the idle map isn't altered!! The later revision of the ProMax chip has a slightly lower rev limit than the first I believe but, for the price, I'd recommend it to anyone.

Regards

Dave

 

[kevin]

ORIGINAL: Computamedic

ORIGINAL: skendrick

On the subject of upgrades has anyone changed the ecu chip over with the Promaxsport chip and if so was there a noticable difference?

I was one of the first to have the ProMax 964 chip and Andrew Sweetenham fitted it for me. I was astonished at the difference it made - not really in terms of sheer performance, although it IS better, but in the pure driveability of the car. It is so much smoother than it was with the standard chip and the idle is also better - even though many will maintain that the idle map isn't altered!! The later revision of the ProMax chip has a slightly lower rev limit than the first I believe but, for the price, I'd recommend it to anyone.

Regards

Dave

But, still no dyno figures. .......even though many have promised these, none appear.


Kevin.

 

[Guest]

hi whats the diff beteen the g-pipe and the cup by the way i just purchased a g pipe how do i fit??thanks

 

[964porker]

The G pipe replaces the muffler on the right hand side, in between the cat and the tail pipe. It will make sense when you look at it, as it couldn't be connected any other way.