Hello there,
My beloved S16 developed a frightening sound upon hard(ish) acceleration in 1st and 2nd gear.
It doesnt matter if you turn the steering wheel or not, it will sound that way even in a straight line.
The sound is hard to describe, but it's like when something is hitting the body of the car from underneath and really rapidly in a series (so it's not just one knock or clunk like when the top engine mount is packed). Stops when I ease on the pedal. Also if accelerating gently there is no sound.
Seems to come from the passenger footwell (or around there) - thats the driver's side in the UK, btw.
I've had the bottom engine mount replaced because it was gone but the sound remains. Top engine mount was also replaced a while ago. Shaft inspected and no faults found. Differential swapped earlier for a 206 GTi one.
Also seems to happen more when engine is cold (or rather it is easier to reproduce that way).
I know it could be the downpipe but I cannot reproduce the sound by simply pulling at it.
Thank you!
B.

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XSi 8V -> S16

almost like backfiring down the manifold?