Chaps, before you jump to any conclusions about any exhaust.
Are you sure its the exhaust thats the main cause for noise on supercharger cars? The supercharger and induction whine on mine at full chat was rather loud, if your cranking up the boost for 350bhp then I’d expect noise to be more induction/whine than exhaust boom.
Not trying to point fingers here but the whine of some supercharger setups is biblical.
not sure how loud my SC whine is outside the car, it is certainly kin loud inside…
My experience is all new exhausts get slightly louder for the first 500 miles, then they settle down. I wouldn’t say the 2bular on mine has got any louder since the initial 500 miles.
The state of tune also makes a big difference. The 8" 2bular on my 300bhp car is loud compared to the same exhaust on a 220 car. If people are struggling with the drive by (not had a problem if I’m honest), I’d be inclined to remove the TRD air box and go back to std.
Heh, an unplanned visit to A&E delayed me somewhat - gettin lively here! Which is good 
ok, it’s difficult to be certain about noise - so many owners have so many states of tune - cats/de-cats/re-flashes etc etc. and it’s the drive-by that catches people out - so weather conditions play their part too!
I realised some time ago that noise would become a big issue and I designed my exhausts to cope with that.
Now, I’m only going to talk about the SC installs because IMO and experience, that’s the ONLY install that needs serious thought on the packing. Re-packables didn’t come into it for me. Most of my customers don’t want the open GT3 racecar look, so the whole re-pack thing with removing the diffuser, then the exhaust before you get down to the re-pack - it’s just not going to happen. I well understand, WELL UNDERSTAND you’re demand for a re-packable exhaust. When I wander down a paddock and see the crap exhausts on some otherwise lovely cars, it makes me cringe. I remember a Noble owner nearly taking a swing at me because I laughed at his exhaust - can’t help it, racers are thick as mince.
When Aston Martin brought out their new V-8 cars, the instruction to the exhaust manufacturer was that whatever goes inside the silencers had to be there in 10 years time. We’re in the 21st century now, material technology has moved on from E-glassfibre or Basalt packing - although I still see this stuff sold/used everywhere.
All of my SC exhausts will be using my new Trackday system with its noise-cancelling chambers. That customer of yours with the system that failed the Donny noise-test will be getting a replacement system using this - it’s been R&D’d, it works, uses 21st century materials and it never needs re-packing.
Now the OP’s exhaust is a unique install. It has a 70mm 4-1 HEADER/DE-CAT with a non-chambered 7x24 silencer - definitely not a quiet exhaust but he didn’t want a quiet exhaust.
I was annoyed on two fronts;
1/. because no-one else has this design, what was the point in asking on here how he would fare with a noise test?
2/. you jumped in with a hard-sell for your exhausts.
btw I would LOVE to see how one of your re-packables gets on with that install - if they’re as good as you say, what could be a better advert?
My contention is that owners do not want to get involved in re-packing exhausts. I design my exhausts accordingly.
Exhaust shoot out? Be good to see them back to back.
[quote=Muu]Exhaust shoot out? Be good to see them back to back. [/quote]but too many variables to be conclusive which is the overriding factor …
If it were my choice I’d aim for a quieter than needed setup with an option to increase noise as and when required … which I did .
Chambered with decat for noise (howls)…
Chambered with sportcat for track …
Both with V Band fitting for quick swapout …
Only drawback is cost ,but if you want all options its a solution.
The only dyno shoot-out that I know of, at Sincs, 2bular came 1st, 2nd, 3rd.I do my R&D.
btw, I was pleased to be sent a Lotus factory SC 4-1 manifold (I won’t say what for) - it has a short primary layout - the best for power/torque IMO and it seems, the factory too.
Anyways, it’s noise/durability of packing we’re talking here.
My inbox has more than a few owners complaining that their re-packable silencers don’t last more than one trackday.
OK, I have been thinking about this a lot as 1. I don�t like pi55ing people off and 2. I make a point of not going all �seloc� and I only ever comment or offer advice on things I have first-hand experience of. For example you will see no comments from me on Carbon Lorraine brake pads, as although I have read loads about them, both good and bad, I have never used them myself, so therefore don�t class myself as qualified to comment.
Firstly I apologise for the �hard sell� as you put it Jim. I genuinely didn�t mean to rain on your parade.
I have used exhausts, quite a bit. In fact every car I have ever owned has had one on (Im not being sarcastic, just trying to be funny 
) I have been trying to think back to why I got so hung up on always wanting a repackable exhaust, and I think it came down to a few bad experiences with unpackable ones getting loud and having to be replaced a good few years ago and since then I have always gone for repackable.
Because I am so into messing with my car, all the exhausts I have had have been bespoke as my cars are never really standard, so they end up costing loads of money and to save having to buy them again, I go repackable, so when (in my experience) it all gets a bit loud, I can simply and cheaply repack them. This is the same story for the SC Honda race car I was talking about.
I have always used reputable companies with lots of motorsport experience and all of my exhausts have been things of beauty. The latest one on my car is no exception and that has 2 full width repackable silencers in the hope to keep it quiet. It cost a fair whack as it was a one off and I didn�t want to ever have to replace any of it.
I have e-mailed the guy that made it and have asked him what packing he uses. It will be nice to see if it is the same as the stuff you use Jim.
As far as JSR exhausts go, we have been asked for and we do have an S2 repackable silencer. We don�t stock them (they are made to order) and as with most things JSR we keep them a secret, so we haven�t sold many of them. There are a good few of our S1 silencers out there and as far as performance goes, we had one fitted to an Elise Trophy car that we run. As everyone knows the regs for Elise trophy are very tight and the only real variable you can have is the air filter and the rear silencer. The car was mapped at Tdi and came out as the most powerful S1 elise trophy car Sam at Tdi had ever mapped. Obviously the ignition was retarded at the top end to give a nice fat and flat power curve and to get under the power limit. So I would like to think they we do know what we are doing to some extent.
Anyway, back to packing. Jim, let me find out what packing I have in my new exhaust and what is fitted into our S1 and S2 silencers (they are made by different companies) and I will post it up here for comment.
Sticking my neck out fellas, two mates tbVh with LOADS more matter than me on any Lotus subject but I’d be very surprised if the JSR exhaust was in any way superior, no similar to a 2bular system. I mean the purity of focus rule applies to me, as in that’s all Jim does and from (again minor experience) having removed my Lotus system (I can hear Gav’s comments) which looks almost clumsy compared to any aftermarket system imho and having major 
issues with a QS system (after 2 TD’s, little road use with a cat 105db Donny Lap 1 black flag 500k miles no more, odd exit angle bla bla burnt out to f**k) would have to back Jim for quality, reliability, service and passion (those same attributes apply to JSR btw). I just can�t write off Jims focused comments compared with your race and invaluable workshop experience. I would have thought that a full system exhaust, cat or decat and manifold would be a wiser choice than just sticking on a repackable end bit. I can�t be arsed to change my own brake pads, which is why I send it to you guys��…Having said that JFK�s has it bang on for me��(again) for the TD�er, but for the racer maybe a repackable exhaust is the way forward, you may as well repack it while you�re doing the other myriad of jobs post race clam off shunt� I guess for me I see a repackable exhaust open to the same amount of variables as a non repackable one in the end.
[quote=jonnyfox]Sticking my neck out fellas, two mates tbVh with LOADS more matter than me on any Lotus subject but I’d be very surprised if the JSR exhaust was in any way superior, no similar to a 2bular system. I mean the purity of focus rule applies to me, as in that’s all Jim does and from (again minor experience) having removed my Lotus system (I can hear Gav’s comments) which looks almost clumsy compared to any aftermarket system imho and having major :mad: issues with a QS system (after 2 TD’s, little road use with a cat 105db Donny Lap 1 black flag 500k miles no more, odd exit angle bla bla burnt out to f**k) would have to back Jim for quality, reliability, service and passion (those same attributes apply to JSR btw). I just can�t write off Jims focused comments compared with your race and invaluable workshop experience. I would have thought that a full system exhaust, cat or decat and manifold would be a wiser choice than just sticking on a repackable end bit. I can�t be arsed to change my own brake pads, which is why I send it to you guys��…Having said that JFK�s has it bang on for me��(again) for the TD�er, but for the racer maybe a repackable exhaust is the way forward, you may as well repack it while you�re doing the other myriad of jobs post race clam off shunt� I guess for me I see a repackable exhaust open to the same amount of variables as a non repackable one in the end. [/quote]
- YouTube
Chris - I thought that was going to be an interesting video :sleep:
Sorry - did my best 
I was warned at donny, following the recommended mods, I am up at 99.
Sean, ever since Hangar 111 here in the UK bought up an un-used 2bular domain name and used it to divert 2bular enquiries to their own website, I never allow anyone to take a dig - and your post on a thread asking about a 2bular install noise-level was a dig IMO.
If you want to post about your wonderful re-packable silencers, start another thread. If you’re looking to drum up business for the guy, tell him to get in touch with me - I’ll keep him in work for years.
So what are the websites to ignore and more importantly what is the right one to review your products?
Only one active is www.2bular.com Steve - I’m absolutely swamped with e-mails, as usual, so it would be best to TEXT me on
07983 431631 - any lunchtime I have is spent on the phone - I’ll get back to you same day.
Website is having a total re-vamp at the moment, new layout/products etc. Present one has grown like Topsy over the years and confuses me, never mind anyone else.
Nice one Jim - thought my exhaust had died but managed to get it welded up with warning if it breaks again in the same place it’s for the bin!