Chiefgroover Posted June 25, 2009 Share Posted June 25, 2009 The easy answer IMO is plenty of straight through mufflers/resonator boxes. I cant see any straight through box having a big effect on performance. A mate's Celica had a 2 box s/s powerflow fitted, can went great, but droned at certain revs. He went back and got another straight through box added, the car went the same but without the drone. I suppose boxes cost money and the more boxes in your £500ish exhaust then the less profit for the makers. I am very happy with my lack of noise, and if the filth get heavy I have two random tech cats which I shall fit in parallel Quote Link to comment Share on other sites More sharing options...
OhGod Posted June 25, 2009 Share Posted June 25, 2009 Damn, Newton Abbot, that's where I live! Still got stock exhaust at the moment so should be OK. Was going for a Tanabe Touring (a 'quiet' exhaust) but even that is 93db - presumably under WOT - so hopefully these tests are at idle. Quote Link to comment Share on other sites More sharing options...
martini Posted June 25, 2009 Share Posted June 25, 2009 what is WOT? With All Toe? Hopefully it is at idle... I have no idea how loud mine is. Loud but not crazy loud. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted June 25, 2009 Share Posted June 25, 2009 WOT = Wide Open Throttle Quote Link to comment Share on other sites More sharing options...
martini Posted June 25, 2009 Share Posted June 25, 2009 WOT = Wide Open Throttle That makes more sense. Quote Link to comment Share on other sites More sharing options...
DSK Posted June 25, 2009 Share Posted June 25, 2009 To be honest, I think this is a direct result of the max muppet crew who drive around at all hours with the boom boxes blaring and exhaust so loud f*ck knows where they buy them or how they make them. Its these idiots that annoy our neighbourhood along with their mates on 2 smoke scooters with sports exhausts really taking the piss. Normal drivers with Subaru's etc are no bother, whilst you can hear the cars they are not being revved up or anti social. I can honestly see Supra's, Subaru's, Evo's getting targets the same as the muppets in shopping trolleys, at the end of the day, every ticket a copper can dish out looks good for them. This has been rumoured for years but looks like its starting to come into force slowly. Quote Link to comment Share on other sites More sharing options...
Guest Rays the roof Posted June 25, 2009 Share Posted June 25, 2009 That makes more sense. So glad you became a member Martini. Now there is someone on here who knows less about cars than I do....! Quote Link to comment Share on other sites More sharing options...
Terminator Posted June 25, 2009 Share Posted June 25, 2009 You must use a calibrated sound meter, not the useless ones on ebay which give very low readings at the high dbA range. They can be 15bdA out. They are only any good for comparing sounds of the same dbA, nothing else. Quote Link to comment Share on other sites More sharing options...
martini Posted June 25, 2009 Share Posted June 25, 2009 So glad you became a member Martini. Now there is someone on here who knows less about cars than I do....! Quote Link to comment Share on other sites More sharing options...
Guest Rays the roof Posted June 25, 2009 Share Posted June 25, 2009 You must use a calibrated sound meter, not the useless ones on ebay which give very low readings at the high dbA range. They can be 15bdA out. They are only any good for comparing sounds of the same dbA, nothing else. Mine cost £195 and has BS calibration certificate. It was part of my leaving present from a company I used to work for, who did there own noise testing on machinery.... Quote Link to comment Share on other sites More sharing options...
Guest Rays the roof Posted June 25, 2009 Share Posted June 25, 2009 Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 25, 2009 Share Posted June 25, 2009 The easy answer IMO is plenty of straight through mufflers/resonator boxes. I cant see any straight through box having a big effect on performance. A mate's Celica had a 2 box s/s powerflow fitted, can went great, but droned at certain revs. He went back and got another straight through box added, the car went the same but without the drone. I suppose boxes cost money and the more boxes in your £500ish exhaust then the less profit for the makers. I am very happy with my lack of noise, and if the filth get heavy I have two random tech cats which I shall fit in parallel I have to agree with you there.... As I'm getting older, I find somethings bug more than that used to... When I was young a stupid loud badly setup exhaust sounded 'cool'....Now that I'm older I get irritated or just laugh at the saxo's and stuff that go past 'farting'. Quote Link to comment Share on other sites More sharing options...
Terminator Posted June 25, 2009 Share Posted June 25, 2009 mine cost £195 and has bs calibration certificate. It was part of my leaving present from a company i used to work for, who did there own noise testing on machinery.... lol I have an adjustable meter and calibration meter for mine. I now put a bung in when I start up at home, park up and remove it, once out of the village. If they tighten the regs I will have to a redesign of my whole 4 inch system. Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted June 25, 2009 Share Posted June 25, 2009 MOT fail now as well. Quote Link to comment Share on other sites More sharing options...
imi Posted June 25, 2009 Share Posted June 25, 2009 3 times the acceptable limit would be? Quote Link to comment Share on other sites More sharing options...
DodgyRog Posted June 25, 2009 Share Posted June 25, 2009 Oh crap, I live in Exmouth, I am tempted to pop down to the Police station and ask them to test it and to get some clarification on how they test it. Might phone them first, just to check I won't get a ticket on the spot if it fails:eyebrows: Quote Link to comment Share on other sites More sharing options...
martini Posted June 25, 2009 Share Posted June 25, 2009 Some Harley's just went past... deafening. No way does my car make that much noise. Quote Link to comment Share on other sites More sharing options...
PJ Posted June 25, 2009 Share Posted June 25, 2009 Vehicle noise levels should be between 82 and 89 decibels and background noise between 50 and 60 decibels. The first £30 fixed penalty ticket was issued after a vehicle exhaust was measured at 93 decibels. Nightmare eh! Somone on the SXOC got a reply from the transport department regarding the new rules: Basically it comes down to this: "Fitting a different exhaust to a vehicle which has the effect of making it noisier is an offence." So that means most of the members of this site with aftermarket exhausts now have illegal cars I would say. However, what about cars like TVR's, Lambo's, Ferrari's, Carrera GT's, Zonda's, Konigseggs, Ascari's, and all the supercars that make well over 90db with stock exhaust systems. A standard Tuscan would probably destroy one of those sound meters? Discretion will definately be needed by the officers doing the tug, fills you full of confidence doesn't it. License to print money??? Thank you Lax Power boys with your bean tin exhausts and thumping sound systems, you're wonderful Quote Link to comment Share on other sites More sharing options...
lockys96 Posted June 25, 2009 Share Posted June 25, 2009 http://video.google.co.uk/videosearch?hl=en&q=caparo%20t1&um=1&ie=UTF-8&sa=N&tab=wv# 2:30 in, um this is road legal Quote Link to comment Share on other sites More sharing options...
martini Posted June 25, 2009 Share Posted June 25, 2009 2:30 in, um this is road legal Well, if it's stock...??? Quote Link to comment Share on other sites More sharing options...
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