997 Kid Posted 1January, 2015 Report Share Posted 1January, 2015 With my Carrera I was considering building my own exhaust from the Cats out. I do have access to one of the best high end race shops and staff. They build race exhaust systems. Anyone built their own using short Hotdogs and/or other sports mufflers. Any suggestions on particular mufflers that are short and suitable. Let's know your thoughts - cheers Link to comment Share on other sites More sharing options...
firstone Posted 1January, 2015 Report Share Posted 1January, 2015 Best to copy a successful formula IMO. Drone very common in the P system by many accounts. Link to comment Share on other sites More sharing options...
Stew F Posted 2January, 2015 Report Share Posted 2January, 2015 I've been thinking of doing my own headers without heat exchangers. Likewise, I have access to all of the specialised equipment and skills needed. All I need is the dimensions of the exhaust flanges as I don't have spare heat exchangers to measure, and I don't want to take mine off ATM. If you have the appropriate measurements and are happy to send them to me I can do the relevant drawings and files that you can send to the laser cutter. If you need that is. Link to comment Share on other sites More sharing options...
Pauly Posted 2January, 2015 Report Share Posted 2January, 2015 Well doesn't matter who builds it really. The only difference what type of mufflers you use. What hotdogs. what material you want your exhaust to be made out of. how short or long do you want it. You can do little things and the noise will change, a Single 3" tip vs a dual 3" blast pipes. the blast pipes (dual exit exhaust that are ~200mm long after the 2-1 section) the blast pipes are louder as there is now less pressure in that section and the sound waves can move around more freely. Link to comment Share on other sites More sharing options...
997 Kid Posted 3January, 2015 Author Report Share Posted 3January, 2015 Thanks for the feedback guys. Yes I maybe able to access a sports race system. If I get that copied it maybe the way o go. Yes worth considering the drone effect. Link to comment Share on other sites More sharing options...
bestexhaust Posted 5January, 2015 Report Share Posted 5January, 2015 Hi, I question the value proposition in copying a successful system, when you can happily buy a system off the shelf for less or the same dollars that a pipe bender can construct one... You can get change from $3K for a ultra-high-quality system imported from Italy, etc... Happy to assist if you wish, I've just heard horror stories of people wanting to save a few bucks and they end up wasting thousands... Is this for a 997.1 or 997.2 Carrera? Mike Link to comment Share on other sites More sharing options...
JustJames Posted 5January, 2015 Report Share Posted 5January, 2015 I've been thinking of doing my own headers without heat exchangers.... There are three things to bear in mind (and you may well have done so), but for the benefit of others I'll state them anyway: 1. Without heat exchangers you don't have real in-cabin heat. I know, a blinding a flash of the obvious, but demisting the windscreen gets challenging. 2. Properly designed headers have an 'extractor' effect with each pulse of exhaust gas working to help the next pulse out the exhaust system. 3. As a side-effect of this, if the relative timing of the exhaust pulses is not what it ought to be, you are likely to get a droning zorst. Link to comment Share on other sites More sharing options...
Pauly Posted 13January, 2015 Report Share Posted 13January, 2015 I couldn't justify spending $3000 on a catback for any car. I could understand if the mufflers where "tuned" but most of the time they're really not. Link to comment Share on other sites More sharing options...
Russ Posted 13January, 2015 Report Share Posted 13January, 2015 from my very small knowledge of exhausts, it's all about length, back-pressure and shape - There's more to it than just bending some pipes and fitting in some mufflers. But i think if you copy a known design you can't really go wrong (unless you're infringing on a patent obviously) Link to comment Share on other sites More sharing options...
bestexhaust Posted 13January, 2015 Report Share Posted 13January, 2015 Muffler design is a big thing in exhausts these days, so just welding together something that's the same shape and even tube diameter with generic mufflers may well sound and flow very differently. And muffler quality varies radically... A big part of the price paid for off the shelf exhausts is R&D and warranty. Most systems I sell are likely to last 40-50 years under normal use, and some actually have a lifetime warranty. Some brands that I rejected from my lineup (PM me for a list of brands) do little or no longevity testing of their product. Point is, if it's "high end"and I don't sell it, you can imagine why... Link to comment Share on other sites More sharing options...
FortuneAuto Posted 13January, 2015 Report Share Posted 13January, 2015 Wouldn't recommend deleting the heat exchanger too. Demisting the windscreen on a cold rainy day will be fun without the heat exchanger. Better off buying an off the shelf exhaust system. Saves you the time and if you don't like it, there's always a re-sale value to it. Link to comment Share on other sites More sharing options...
Pauly Posted 13January, 2015 Report Share Posted 13January, 2015 from my very small knowledge of exhausts, it's all about length, back-pressure and shape - There's more to it than just bending some pipes and fitting in some mufflers. But i think if you copy a known design you can't really go wrong (unless you're infringing on a patent obviously) I'm not to sure length matters to much. But the mufflers do matter. Glass packed, stainless packet, baffled. i mostly see with tuned mufflers are helmholtz resonator type. But material matters also. Mild steel. Stainless steel. Titanium.. Link to comment Share on other sites More sharing options...
bestexhaust Posted 10March, 2015 Report Share Posted 10March, 2015 glass/fibreglass packed is at the very very cheap end of the spectrum. For longevity it should be stainless steel wool and/or rockwool packed. Fibreglass wool becomes water laden between drive cycles and sinks to the bottom of the muffler, usually causing rusting. Link to comment Share on other sites More sharing options...
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