People who make their cars sound gid loud



DaveH said:
I'd put a decibel test into the MOT if I had such power. There is no need for making a small 1.2L family car sound like a Harrier. I used to live near some chav scum who would be driving back and forwards into the early hours of the morning waking every poor sod in the area up.
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Is there not already one? I know there definately is in the SVA test for kitcars and imports.

Paddy O'Dors said:
An extra 1bhp usually.
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Unlikely there is any BHP increase with just a catback system , if there is then it will be 5 or less BHP. Most of the restrictions in an exhaust system are in the catalysts , and the size of the tubing from the manifold out , so a less restrictive manifold , combined with sports catalysts or a decat (illegal iirc) combined with the catback system will give the biggest gains. Its expensive though , especially when you add the cost of a remap to make the most of the better breathing , and you should really add a cold air intake system too for best results.
 
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After doing some research, there is a limit:
Cars and noise

However this is not tested on the MOT:
MOT Test Exhaust System

A car can fail if the tester deems it too loud but reading a few sites, nobody ever fails. I suppose because it is not a measured test, if you have a choice between a garage who will ignore it and a garage who will, then you will take it to the garage that will see you through your MOT. It is in the business interests of a MOT test centre to pass a noisy exhaust.
 
My cars pretty loud after 6k revs. So at the moment I wouldn't get an aftermarket exhaust fitted but if I did I wouldn't really care what any one thinks if I liked it

West_Winger said:
Thing I don’t get now is why car manufacturers modify their exhausts/set the engine to dump droplets of fuel into the exhaust to make them sound like they’re farting every time you change gear.

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Because most of the people who would buy a golf r want that
 
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carldp1989 said:
My cars pretty loud after 6k revs. So at the moment I wouldn't get an aftermarket exhaust fitted but if I did I wouldn't really care what any one thinks if I liked it



Because most of the people who would buy a golf r want that
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Aye but any 4-cyl engine sounds shit, especially with a farting exhaust.
 
anth said:
It depends, if they just change the back box then it's all noise and absolutely nothing else, if they change the full system for a much better one and have other modifications and remapped to suit then it can add a extra horsepower. Why you'd want spend that much to add extra horsepower rather than buying something else is another matter.


bikes are a bit different, if I was riding one I'd feel safer knowing drivers around me could hear me and knew I was around.
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Lots of new electric motorbikes are pretty quiet. The designers at Harley Davidson have decided to try to retain their core followers with something that sounds like a jet engine!
 

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