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[YZ250]

I wonder how many have told the insurance they have these exhausts on, my son bought a car with one fitted,thought no more until he was rear ended, the assessor saw the car and next thing was insurance declining to pay because they were not informed of the modification even though he bought the car as it stood.....

Ooh, that's not good.    Some people genuinely wouldn't know what was standard and what isn't but if it gives the insurers a way out they'll go for it. 
My exhaust isn't noisy but it is stainless so I notified my insurers and they added it under the 'modifications header' on the certificate. Better safe than sorry. 

[Gaffers]

my V8 pisses all over the little boys in their lowered 1000 cc corsa....prefer to hear to hear a V8 any day

So does my milk float.  I had a full charge coming back from London last night and some barry boy was trying to get away from me at the lights to cut ahead of me through the roadworks.  He floored it after it went green and then, when seeing that he couldn't keep up, he backed off as if to say 'Ar, I werent trying, honest' 

Oh how I laughed

[aaronjb]

A few years ago the turbo rally cars were set up to keep the turbo spinning when the driver lifted off the throttle, don't know how it was done but the side effect was a series of impressive backfires.

Easy peasy - when the throttle is shut add air to the cylinders via a bypass mechanism and continue to inject fuel, but trigger the spark plug so late in the cycle that the resulting combustion goes straight out of the open exhaust port keeping the turbo spinning.

Valves, seats, exhausts and turbos don't last long doing that but that's just fine on a rally car that gets rebuilt every stage/rally..

I've seen some aftermarket systems that dump fuel, air & spark straight into the exhaust runners so at least all you need is a turbo rebuild rather than an engine rebuild.

http://www.rallycars.com/Cars/bangbang.html


Backfiring when lifting off in a road-tuned turbo car is usually the engine pegging rich as a vent-to-air dumpvalve opens on a MAF based engine management system (engine goes rich and then the vapour will combust either on the hot exit of the CAT or in the silencer with no CAT).  RX8s (naturally aspirated) tend to do it when decatted as they run pig-rich all the time and if you lift off at the redline a little unburnt mixture goes bang in the hot exhaust.

[omega3000]

When i had my Aprilia rsv 1000 you could easily make it backfire by over revving the v twin and flicking the engine on/off button 

[Stemo]

My mate had an orange ford anglia with tinted windows and liked nothing better than to sneak up on a bus queue of old ladies and turn the ignition off as we passed. Woke most of them up, probably killed a few, we never hung around to find out.