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G pipe and Cup pipe

911kev

911kev

New member
I know this has been discussed previously but I am looking to replace the rear silencer box on my 964 which has corroded.
The car currently has a Cup pipe fitted and I am looking to put on a decat pipe and then replace the final silencer box with a G pipe.
Has anyone had this combination. I won't be tracking the car so the noise level isn't a problem but also I don't want a constant unbearable droning.
Finally, does the G pipe fit straight on to the Cup pipe?
Thanks
 
Kev,

With the cat replaced with a bypass, the Cup Pipe fitted and the final silencer replaced with a G Pipe you will have no silencing at all - effectively a straight through exhaust. Not only will it be unbelievably loud inside the car, it will be similarly unbelievably loud outside the car - the the distinct annoyance of your neighbours and those in the adjoining roads and similar postcodes!!! Not to mention the BiB!!!

It's something you REALLY don't want to do for any long term comfort. A 964 so equipped makes a Concorde sound like a pussycat!!

You'll need EITHER a primary silencer (instead of the Cup Pipe) or a secondary silencer (instead of the G-Pipe). One or the other at least.

Regards

Dave
 
I remember GregL did this IIRC at our jaunt at the windmill, you could hear him coming for miles.....great sound, but I guess it'll some get tiresome.

kevin
 
Thanks for that Dave.

I have been speaking to Hayward and Scott as they have done exhausts for me in the past. They do a decat pipe and a new rear silencer that runs along the rear, replacing both the original silencers. I have been really pleased with their workmanship in the past.
Has anyone had this combination fitted?

 
A cat-bypass, cup pipe and G-pipe will be just about as loud as a really loud thing turned up to 11 - which is exactly what Greg's car sounded like at the Windmill and on the run up to the P911 picnic. Sounded wonderful!

I'd suggest either a cup pipe with the secondary silencer, or a primary silencer with G-pipe. No silencing will be just too loud.

My car has a cat-bypass, Cargraphic dual outlet rear silencer and a G-pipe - it's loudish in a burbly, bassy sort of way. I'm thinking about going back to standard rear box and G-pipe to see how that sounds - and get it noise tested to see if I can get it on a UK circuit.
 
ORIGINAL: 911kev

Thanks for that Dave.

I have been speaking to Hayward and Scott as they have done exhausts for me in the past. They do a decat pipe and a new rear silencer that runs along the rear, replacing both the original silencers. I have been really pleased with their workmanship in the past.
Has anyone had this combination fitted?
Click to expand...

Kev,

I've got a cat bypass and a H&S dual outlet exhaust - registered 103db at Oulton last year. Will bring the car down for you to hear if I manage to find a free weekend.

Cheers,

Talat
 
Or you could listen to mine, I'm in Essex, running 100cell cat and Dansk dual outlet, measured 104 at Curborough last year, although I think thats not entirely accurate [:D]

kevin
 
ORIGINAL: NENO

So if the Cup pipe and a G pipe is way to loud what's the relative difference in levels between the two options?

I have a G pipe but I want a little more noise, will putting on a cup pipe and going back to the secondary silencer make any difference? And if so what?
Click to expand...

Normal primary + G pipe is louder than Cup pipe + final silencer. I've had both these combinations and preferred the second option - it felt in a seat of the pants sort of way to be more powerful than the G pipe. In my opinion/experience the G pipe is all noise and no go.

I currently have normal primary + normal secondary because I've had a de-cat put on. I was worried that the de-cat would be too loud if I left the cup pipe on but the de-cat/normal/normal set up has proved to be surprisingly quiet so I may try swapping the normal primary to the cup pipe again to see how it sounds. I need mine to stay below 105 db to get on trackdays.
 
Mike,

If you're after more noise than the standard/Cup/G options give you it may be necessary to go with one of the dual outlet options as Kevin has suggested. There are a few manufacturers such as Dansk (like Kevins), Fabspeed (like mine) and Hayward & scott. They all rely on a single silencer sitting behind the rear bumper (as with the standard primary silencer) but with direct outlets. The Fabspeed has the option of running with a single outlet which avoids the issue of having the cut the nearside bumper. Most are quite a bit louder than the standard options but do tend to vary quite a bit so you need to be a little careful if you plan to track the car as they can very easily take you over the sound limit.

Regards

Dave
 
ORIGINAL: kevin

Or you could listen to mine, I'm in Essex, running 100cell cat and Dansk dual outlet, measured 104 at Curborough last year, although I think thats not entirely accurate [:D]

kevin
Click to expand...

Take a look at this video to hear what Kevin's sounds like on fly by [:)]

http://www.youtube.com/watch?v=qpbDKrOJePk
 
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