Backfiring, bang bang

Hey hey
well the other day i saw a nice plain sprinter in a car park hold it in first, compression brake to slow down to a speed hump, and see this flame pop out for a split second, like a flash and a big bang.

Talking to a mechanic friend of mine he mentioned a technique called key banging it... Tried this where u boot it in 2nd or third, keep ur foot down and at about 3 - 4k switch off the ignition, give the pedal a pump then flick it back on.

I got little bangs, granny farts compared to the one this sprinter did. I think the sprinter had the original engine in it.

I have an 89 civic, dual carb .. just wondering if n e one knows other techniques to get a big bang, but none of this spark plug in the exhaust rice business...

yeah shave your head down all the way then use a thin head gasket.
some guy did this with my old crx before i bought it.
used to back fire during shifting and burp out flames.
dont recomend it though. doesnt seem too healthy.

hmmmmmn ever since i put a test pipe on my car it seems to throw a lil flame out my muffler at 1-2 upshifts....as well as boucing off the rev limiter.

Any other reasons why this might happen?

Um you can modify a 6cyl disributor cap to work, wire 2 wires and 2 spark plus to the back of the muffler, and get a test pipe cat . YOu will be flamin the whole way around.

nar, thats pretty ricey

Just curious how it happenes naturally