I had a single Cherry Bomb sidepipe on my 100E and it failed its MOT for being too noisy - and to be fair it was too noisy. What Dez sez about them being thick metal is true. I had to the car so low it would drag along the ground when cornering with mates in the car. It would sound something like KEEEERRRRRRRRRRRRRRRSHWINNNNGGGG as you went round the bend!!!!!
I added a Cherry Bomb copy to the middle of my Anglia's exhaust to take the noise down a bit, but when I last had the exhaust off it sounds like there is no packing left in it. It rings like a bells so there's clearly nothing left in it ;D
The sidepipe I had on the Pop was literally the 4-1 manifold with a Cherry Bomb bolted to it, a 90 degree bend to take it out the side and that was it. That one was DAMN loud but sounded like it had balls like a pair of baked spuds.
I had one fitted to my system on the green car as I found the custom exhaust a bit raucous and loud (I'm old), now it has a nice, fruity sound to it. It's an inline cherrybomb rather than a tailbomb (chrome tip) though so I keep the subtle normal tailpipe and there is another silencer in there too. (Damn, I must be really old!)
Going to chuck this in here as its relevant, I'm going to be getting myself another cherry bomb, how far is the back box allowed to stick out from the bumper?
I fitted one to my first car, a 957cc mk2 Fiesta, sounded great at the time but people heard it coming twenty minutes before I got there! I sold that car but kept the cherry bomb and made a centre exit for my next Fiesta, a mk1 XR2. I cried when I sold that, it sounded awesome as it drove away.
Swings and roundabouts for me regarding cherry bombs. On some cars (a couple of V8s and the Scimitar in this thread especially) they do sound lovely .
On some of the 4 pots, they are a little too raspy and loud for my tastes. Great when you are 17, not so great when you are trying to hear yourself think down the M40 at 8 in the morning (I guess it wakes you up mind you!). That was a MkIV XR3i with a made to fit (or rather we bashed it to fit (they were not made that well, and the metal was very thick to bend!)) back box on a stock exhaust system. I am sure it was louder than most 'downpipe back' exhaust systems !
The MGB came with a cherry bomb in the centre section (normal 'box on the rear). The Falcon single 'box system on my other 'B had much less rasp to it :
'72 Mercedes W108 280SE 4.5 '79 Honda NC-50 '03 BMW M3 Coupe '08 BMW E91 325d M-Sport Touring Pre-LCI '16 Yamaha XSR700