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Exhaust upgrade

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wayne1

New member
I have been reading previous posts regarding upgrading the exhaust on the Cayman S. I am interested in the Carnewal system from Gert in Belgium, recommended by some of you. I appreciate that he has included some sound clips on his website, however in my opinion there is no substitute to actually witnessing the sound under acceleration first hand. My question is; does anyone own a Cayman S with this Cat back system fitted that would be prepared to allow me to pay a visit so that I could hear it before making a decision. My location is 8 miles from Chester.

Many thanks

Wayne
 
Last minute change on this, I have now ordered a Remus system. Fingers crossed it will be pleasing to the ear.
 
I was going to recommend the Carnewal! I'm nowhere near chester but could have sent you some phone and go pro videos. Hope you enjoy the Remus anyway and if you change your mind about Carnewal give me a shout.
 
Thanks for the reply, I almost went the Carnewal route but changed my mind at the last minute and ordered a Remus system.
 
Do you expect any performance increase from fitting either of these systems? I read that they dispense with the rear 2 CATS which allows better breathing and more power. The Remus is a lot more expensive than Gerts (~400e) isn't it so why choose that one? Is the MOT affected?
 
Here are my reasons for deciding to go with the Remus system as opposed to the Carnewal. The Carnewal system costs work out as follows: 495 euro = £388 for exhaust itself 400 euro deposit refundable when you send you old system to Gert = £313 Black exhaust tips 390 euro = £305 Cost of posting your exhaust out to Gert approx £40 Therefore total outlay = £733 against the cost of a Remus system £900 My thought process to justify the additional £170 outlay was as follows: Firstly the design of the stock exhaust in my opinion is ridiculous when you consider the T piece design of the tail pipe (Gen 1). The exhaust gases are fighting one another to exit. This goes against all principles of free flowing exhaust set ups. The Remus system has two individual tail pipes which alleviates the problem. Both systems do away with the Cats in the back boxes. I think from memory the Carnewal system is said to produce an approx BHP increase of 5-7 BHP whereas the Remus system is said to produce approx 15-17 BHP. I would not get carried away with either of these claims however I would expect the Remus to produce greater gains than the Carnewal due to the elimination of the T piece design. The next point I considered was that by going the Remus route I would be replacing old with new rather than substituting old for second-hand. The other factor worth considering is that if you came to sell the car, by going down the Remus route would provide the option of refitting the stock exhaust and selling the Remus system on which would provide a greater return than the initial £170 additional cost. Finally to answer the question about the affects on the MOT, both systems work on the basis of the back box cats being removed which to my understanding are designed to reduce emissions when the engine is cold. As the engine reaches normal operating temperature the cats in the headers take charge as it were. MOT emission tests are only to be conducted when the engine is at normal operating temperature and as such does not give rise to any issues regardless of which system is decided upon.
 
I understand with your argument for Remus and in my experience you can get a large %age of what you spend back again if you sell an after market system and put the old system back on, minus your labour costs. Do you plan to get your car rolling roaded before and after so see what the bhp and torque curves are, as 15-17bhp is quite a lot, getting rid of those CATS would account for most of it on both types? The Gen II has a redesigned exhaust which sounds quite good above 4000 and perhaps they took the time to remove the T piece as you pointed out. Does anyone know if the Gen II is actually more efficient?
 
I have no plans to have my car dyno tested as i'm more interesteed in improving the sound than outright performance gains. Should there be a performance gain then I would consider that a bonus. I'm sure there will be some gain but imagine it won't be that noticeable, but will probably feel more responsive. I am happy with the exhaust tone of the standard set up when you hit the 4000 rpm range but from what i've read this is enhanced further by fitting a performance exhaust. Whilst I accept the standard system on the Gen 2 differs from the Gen 1 to my knowledge it still has a T piece tail pipe albeit a slightly different design. I also believe that the Gen 2 additional power over the Gen 1 can be mainly attributed to the redesigned exhaust.
 
The Gen II engine, being DFI has many improvements over the Gen I and I don't think its the exhaust alone as it still has two sets of CATS. I since checked up on Remus and a California based tuner dyno'd before and after and got up to 20 BHP improvement in the mid range on a Gen I Cayman. It certainly looks as well as sounds a nice piece of kit, perhaps you can email me with the details of where you are getting it from in the UK.
 
Slightly off thread but I hope of a bit of interest! I have just sold a Gen 2 2.9 Cayman and I loved the sound of the (standard) exhaust above 4000rpm, a lovely barking, howl. I have just bought a Gen 2 997 Carrera with sports exhaust and I just don't think it sounds anywhere near as good as the Cayman. Just my thoughts and the fact that either of these two upgrades I bet, will sound fantastic. Enjoy!!
 
The T pipe part is down to the tip design. If you get the black cayman r tips then each pipe comes out separately. I don't think it will have much difference overall in the system but then I'm an electrical engineer not a mechanical (although the principles are more similar than you might realise). I've heard the remus system and personally I prefer the carnewal but every man is different. Chris, I promised you some videos and sorry I forgot but I will sort them out soon. In the carnewal system you are not really buying a new exhaust, you are paying for gert's time really. The result is a good and reasonably priced peice of kit. You don't have to buy tips from him, you can re-use your own. I think Gert is owe me a set of 200 cell cats for all the praise I've given him since last October!! :)
 
Once this is fitted can you confirm the existence of a 'exhaust boom' at circa 2500rpm? Also how is it at cruising speeds 70 - 90 mph? (sorry officer)
 
Here is the tale of the exhaust. I phoned 3 exhaust shops for a price to do the work for me, two of which wouldn’t take it on as they weren’t supplying the exhaust. The third one said they would do it but they needed to take a look at it first. The reason for this was that in their words ‘ it’s a 2 hour job and if the nuts are corroded it could take longer and the price would go up’. They quoted £98 for 2 hours work. I thought this could turn out to be double the quoted price so decided to do it myself. I decided to tackle the infamous nuts on the exhaust flange next to the primary cats only to find that I couldn’t get a spanner to fit, 10mm was too big and 9mm to small. These nuts are supposed to take a 13mm spanner I believe. They had literally shrunk in size due to corrosion. To remove these nuts I had to resort to using a dremel to split the nuts. Anyway to keep a long story short I have completed the install today. I took it for a run and these are my findings: Upon start up I was over the moon, the difference is night and day and I was 110% pleased. When driving with the window down in a built up area the sound bouncing back off the walls was awesome. The bad part is that despite what people say, there is a lot of booming between 2000 and 3000 rpm, not just a bit like people claim. I took it on a duel carriageway and driving at 70mph was quite acceptable, no different to the stock system. I didn’t notice any increase in power to be honest although one would think the deletion of the secondary cats must give rise to some increase. So to sum up, the jury is still out because I have only took it for a short run. I will let you know my thoughts in a week’s time.
 
Does anyone know if a Cayman S exhaust system will fit a standard Cayman 2.7 ? No one seems to list a replacement system for the non S Cayman, thanks, Martin
 
Dimensionally, I wouldn't have thought that there's a significant difference between the two systems Martin but you'd need to check with Porsche or a specialist before commiting to a purchase. Bear in mind that each system (and the DME) is tuned for its specific engine, so it's difficult to predict what would happen if you did change the exhaust. What do you hope to achieve? Jeff
 
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