Ade 517 Report post Posted February 3, 2017 14 minutes ago, S18 RSG said: Well, the thread is about the volume of exhausts. I think many people would be surprised to hear that an unsilenced, uncatted exhaust system on a turbo car is perfectly livable, whereas a supercharged car may require a lot of extra silencing. I saw that more as useful consumer advice than point scoring. I'm not that much of a dick that I'll find any opportunity to belittle your opinion or choice, just trying to make a useful contribution I actually thought t it was common knowledge! Everyone has different levels of tolerance/desire for noise. I dont want to hear anything more than a mild burble wot at 3krpms, the sort of level you have to listen for rather than be forced to hear it. Plenty of people couldn't see what I was complaining about with my last cat back which was 92dB@5k. Certainly with the stock cat back its very quiet, but everywhere which is not what I wanted. Also small piping. The Cossy SC adds approx 3dB to the standard noise test at 5k rpms over N/A. Higher power from the SC will add more. More flow = More noise. Share this post Link to post Share on other sites
surrey86 352 Report post Posted February 3, 2017 Looks great. I really like the Hayward and Scott catbacks and am also concerned about noise so this thread is very interesting. 1 Ade reacted to this Share this post Link to post Share on other sites
Steeps 294 Report post Posted February 3, 2017 Don't think I've ever been out in your car on the road, but on track the new H&S kit pre-resonator was a lot more comfortable than the Cosworth catback but still suited the car very well. I know exactly what you mean with the drone at 3k WOT as it can be an issue when using cruise on a motorway... I think going 1.3 might make this worse 1 Ade reacted to this Share this post Link to post Share on other sites
Ade 517 Report post Posted February 3, 2017 6 minutes ago, Steeps said: Don't think I've ever been out in your car on the road, but on track the new H&S kit pre-resonator was a lot more comfortable than the Cosworth catback but still suited the car very well. I know exactly what you mean with the drone at 3k WOT as it can be an issue when using cruise on a motorway... I think going 1.3 might make this worse I think it should be possible to fit the Helmholtz Resonators to the cossy system. I've asked Ian for a price for that. Share this post Link to post Share on other sites
Church 209 Report post Posted February 4, 2017 Given on mostly 4.5K-redline being most common on track (and where i'd want extra roar to hear), imho quietening below 3K is wise move. Should also quieten cold starts with no tune mods at all. Share this post Link to post Share on other sites
Bfranklyn86 52 Report post Posted February 4, 2017 You should pop this on FT86 forum too, Ade. People/companies have gone to great lengths to get a catback which is high flow but also livable, and passes noise restrictions. (The ACE/CSG catback as an example). So if you've achieved it then put it out there! 1 Ade reacted to this Share this post Link to post Share on other sites
Ade 517 Report post Posted February 6, 2017 You should pop this on FT86 forum too, Ade. People/companies have gone to great lengths to get a catback which is high flow but also livable, and passes noise restrictions. (The ACE/CSG catback as an example). So if you've achieved it then put it out there! I dont think it will be that quiet with a catless manifold and frontpipe. Leguna Seca is very strict.... and you see stuff like this 😂 Share this post Link to post Share on other sites
Adam9 37 Report post Posted February 13, 2017 Did you manage to get any info on what they would charge to do another one of these yet Ade? Share this post Link to post Share on other sites
Ade 517 Report post Posted February 13, 2017 17 minutes ago, Adam9 said: Did you manage to get any info on what they would charge to do another one of these yet Ade? Yes mate. So pricing looks like this: Cat-Back with 70mm piping and the extra larger center silencer £650 + VAT Exhaust Tips of your choice: Varies but roughtly ~£75+VAT Helmholtz Resonators: £275+VAT Above priced are fitted. Please note this system differs from their standard offerings in that it has 70mm pipe diameter and the extra larger middle box is bigger than their "larger center silencer" on their website. If in doubt talk to Ian at H&S about your needs. 1 Rich reacted to this Share this post Link to post Share on other sites
Adam9 37 Report post Posted February 13, 2017 Thanks mate, not cheap but still looks like pretty good value Share this post Link to post Share on other sites
Ade 517 Report post Posted February 13, 2017 9 minutes ago, Adam9 said: Thanks mate, not cheap but still looks like pretty good value H&S are not the cheapest but their quality is top notch and comes with a lifetime warranty (subject to their conditions). Share this post Link to post Share on other sites
Ade 517 Report post Posted February 24, 2017 Finally a sound clip from my phone. I've got some go pro footage I will upload if the sound is better. 2 Church and Keethos reacted to this Share this post Link to post Share on other sites
Bfranklyn86 52 Report post Posted February 24, 2017 Sounds really good actually. Not too tiny - just deep and powerful sounding. 1 Ade reacted to this Share this post Link to post Share on other sites
Adi 40 Report post Posted December 7, 2019 Hey Ade, would you mind sharing the specs for the resonators ? Wondering if I could attach them to an HKS Hi-Power Spec-L that has the same issue you had, boomy at WOT around 3k, especially when combined with a Tomei decat EL manifold that seems to seriously increase those frequencies. The HKS is differentand the specs would help me figure out if they would fit. Cheers, Adi Share this post Link to post Share on other sites
Ade 517 Report post Posted December 7, 2019 Hey Ade, would you mind sharing the specs for the resonators ? Wondering if I could attach them to an HKS Hi-Power Spec-L that has the same issue you had, boomy at WOT around 3k, especially when combined with a Tomei decat EL manifold that seems to seriously increase those frequencies. The HKS is differentand the specs would help me figure out if they would fit. Cheers, AdiHi Adi, pop me a PM and can discuss. Just recently I helped a guy with his cobra. We had to modify the dimensions a bit but the target frequency was the same and worked a treat just with one resonator chamber. Share this post Link to post Share on other sites