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Exhaust Boxes ?

Andy B Aces High

New member
Anyone fitted either the Design Tek or Dansk Exhaust boxes marketed by Design 911 ?

If so do they give a nice exhaust note and did you notice any resonance on motorways etc ? How do they compare to the RSR type boxes marketed by Carnewal ?

Cheers,

Andy.
 
NO have not and will not now.

I met a fellow 993 er at a 964 meet in South London. who admired my cheap LPMM exhaust compatred to his H&S system. i am sure theres was good but... Leland Pate (USA) came up with a novel approach which has a crossover pipe join between the silencer in and out pipes; result, great idle sound and a roar on sudden acceleration, otherwise fine and no vibration. I call it a tunnel seeker.

It cost me approx £125 to get this trick done on both sides (welding, fitting 1 5/8" pipe and rust painting) from a guy who does car welding. It is not quite as good as this (but then what is?):

http://www.youtube.com/watch?v=t8pKMG9uUMs

that may have the CAT removed also, but I have not heard a better exhaust (on 993). I have heard the RSR's and they are OK: they have more treble and less bass. Search on the Rennlist 993 forum for plenty of discussion. Do I need to say I am happy with mine.
 
If your boxes are ok,you could just go for the Dansk de-cat pipes from Design 911,they are £200 and sound just like that,maybe a tiny bit quieter.
They save about 10kgs off the tail end,fairly easy to fit and cheap.
I found no loss in power,as many suggested i would.In fact i feel mid range grunt is better.
It even passed the cat test when put on my Mot mans machine,he said its because 993 burn the fuel/air mixture so efficiently.
You are welcome to come and listen/try mine.
Dan
 
Shaun, is that what they call the LPMM mod, Hayward and Scott have quoted me £150 to carry out this mod to my boxes but I need to check that mine are ok to weld. The car in the video sounds great, just how I would like mine to sound.

Angry, do the De Cat pipes do away completly with the Cat or do they just bypass it ?
 
Yep,they do away with the cat,they have a threaded hole for the lamba sensor,and you do not get any warning/managment lights up on the dash.
Theoretically you may have probs with the MOT.My local mot man is a friend of mine so he would have let it go anyway,but he did put it through a proper cat test and it still passed!
There is a lot of mythes,that the car will not run as well and loose power,but i have found the complete opposite-
more mid range and better fuel consumption and i have not had a remap or other tuning.
I deal with a guy who has been racing Porsches for 40+ years,and he completly dispelled all the myths when i spoke to him about and he highly recommended it.
Dan
 
ORIGINAL: Andy B Aces High

Anyone fitted either the Design Tek or Dansk Exhaust boxes marketed by Design 911 ?

If so do they give a nice exhaust note and did you notice any resonance on motorways etc ? How do they compare to the RSR type boxes marketed by Carnewal ?

I researched this quite intensively. If you want the best sound, without boomy boxes, then go for the RSRs. I'm very happy with mine. As for anything more exotic/antisocial, I can't help you there, but I have heard some e.g. Cargraphics, which seem awfully loud. Good on a turbo etc perhaps? :p

RSRs will pass the noise test on most trackday events...
 
Andy

Yes the LPMM mod is a straight pipe between the in and out silencer pipes. The larger the pipe you choose makes the more bare noise more bass in pitch.

I have seen a photo of a 993 silencer cut open and there is a top and bottom section. The top internal section has a short pipe leading to the exit and the bottom section has more silencing material. So all boxes have a pipe inside. The RSR is known for having some of the inside steel wool/silencer mix cleaned out and it looks very clean on delivery, but after install the boxes are nearly invisible.

I have heard a pair of RSRs next to my LPMMs in the open. The RSR had more treble had more resonance when sitting inside the car and revving up to 5k. I think each had similar volume, but the RSR sounded slightly more Subaru-ish due to its pitch in my personal opinion. I cannot comment on the term booming used earlier as it is not defined. My 1 5/8" mod sound is preferable to me owing to the lowered idle pitch sound and the lower pitch on acceleration. I do get the occasional slight pop on sudden de-revving.
 
Andy
In the picture below, the left hand exhaust is the standard 993 box cut open and the all the wool & wadding removed. The box on the right hand side of the picture shows the internals of a the RSR exhaust.
Graham

2169A48DAD1D426C80382275EC857150.jpg
 
Hi Guys, I did this LMPP mod is it ??? on my 993 the weekend for the second time, first time I did it using approx 1" tube which gave a nice sound with a bit of a rasp to it, second time was using approx 1 3/4" pipe, deeper sound and seems a bit louder top end as well, well worth the £5 to do I think anyone would be happy with the sound.

Any idea on noise levels with the external pipe for track days ?
 
Graham,
In the pic of the standard box there is still a transfer pipe, is this as supplied by porsche? Does the RSR mod entail cutting away part of the internal tubes then, if so do they add some kind of wadding material or does the box remain empty?

Paul,
Are you going to the Moat Wednesday ? If so will have a chat then on who/how you moded your boxes. Wil you have the 993 there if you are coming ?

I am much keener on the tranfer pipe outside of the box.

Andy.
 
Yes Andy, the standard box has the small bore connection pipe - presume just to add a bit of volume? The RSR mod entails slicing through the weld (either using a plasma or slitting wheel) removal of all the internal wadding and then chopping through the two pipes leaving them 100mm long. The box is then re-welded up back together. An additional mod (which I did on mine) was to refit the bellmouth back onto the discharge pipe to reduce the entry losses.
Cheers
Graham
 

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