got a problem...
 

got a wierd sulphur smell comin from my exhaust...got a 04 1.8t....accidently put 87 octane in this mornin...kinda feels like i lot a cylinder...anybody know whats up???????

Actually i heard smell occurs when cat or exhaust gases are not enough which causes the process to be incomplete due to which the musty smell occurs,the part of car as catalytic converter which smells at initial stage.

is the initial stage of the cat. converter going bad...