Menu toggle

Intro & Gundo hack

G

gav_doyle

New member
Hi All,
I'm new on the 997 side having traded in my 996 last weekend for a 2007 manual C2s in absolutely immaculate shape.

My old 996 (pictured) was an aero kitted car with sports exhaust, the new one has none of the kit nor sports exhaust and I've realised what a big difference to the driving experience a sports exhaust system can make, but now that I'm totally tapped out on the savings front am looking at the Gundo 'hack' to bring the extra smile.

Which brings me to my questions;
What are the pro's and cons of the 'hack'?
Is it MOT legal?
Will the car need a remap?
Does it only effect the sound? Or have any negative impacts on performance?
The standard system is quite quiet - how much louder is a car hacked, would it become a nuisance?
 
Just be careful saying it is MOT legal, it is not MOT legal but normally doesn't cause any issues as the regulations are somewhat subjective. Anything which raises the noise over that of standard car can be deemed as an MOT fail but the chances of this being failed at slim I would say. Here is an exert from the UKmot website where the testers discuss these type of things

'Question: ‘We have an increasing number of ‘boy racers’ in our area whohave excessively noisy exhaust pipes, which I consider to be a nuisance.How do these vehicles pass the MOT test – aren’t they illegal?




Expert Answer:
This letter is just one example of the many queries we receive on the subject of noisy exhausts. Given that there have been some recent changes to the Inspection Manual in this section, I thought it was a good time to cover this area of the test.

It is likely that many of these ‘big bore’ exhaust systems don’t meet the requirements of Regulation 54(2) of the Road Vehicles (Construction and Use) Regulation 1986 as amended: ‘Every exhaust system and silencer shall be maintained in good and efficient working order and shall not be altered to increase the noise made by the escape of exhaust gases.’ I don’t think this needs any further explanation, do you?!

Clearly the fitting of aftermarket exhaust systems is becoming an issue. As I have responsibility for MOT technical standards, I need to make sure that the guidance given in the Inspection Manual is clear, and that the Reason for Rejection (RfR) does not confuse.

The Method of Inspection in the manual is to ‘assess subjectively the effectiveness of the silencer in reducing exhaust noise to a level considered to be average for the vehicle’. This is open to some interpretation and we quickly realised that the Method of Inspection gave no indication of what engine speed should be achieved before the noise of the exhaust is assessed.

To remedy this, we have added a note to the MoI which now requires testers to assess the level of exhaust noise at all engine speeds required for the exhaust emissions check. We have also made a slight amendment to the RfR, which now makes it clear that the comparison is with a similar vehicle with a standard silencer in average condition.'

Ian
 
The Gundo hack is much lower than the uk max decibels limit, and is the same change as the factory PSE (just not switchable) so I can't see it being an issue.

I find that on the Motorway it's no difference than stock. I'd go for it... actually I already have.... twice.
 
I don't know anything about this - is it something that could be done on a 997 Gen 1 Turbo, which is very quiet? If so what is the cost and where does this get done?
Thanks
Stuart
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top