This car modification is usually done to Asian import cars, but not always.
Considered the opposite of Pussy Tubes
"Nice Fart cannon, does it make your peice of shit 1998 honda civic DX do anything special other than making it sound like it is taking a shit everytime you lay on the gas?"
"Fart cannons are the opposite of pussy tubes"
used by chavs (uk) and ricers (us)
chav: bu' it' 'ard innit ya goffic nob