Noisy exhaust bought on ebay (75 KV6 2.5 auto 1999)

[xsport]

Another thing to bear in mind , is that the diameter of the exhaust . 2.0 kv6 2.5 kv6 and 190 kv6 are all different diameter. Which can cause a problem to join to the back box .

[Costa Fortuna]

When I first got got my 1.8t it sounded awful, boomy and rough. Thanks to members on here who said how quiet the car should be I took the risk of buying a clamshell type which is what the OE spec looked like.

Super quiet now just as it should be - sorry can't remember the make, my local factor supplied it.

The original one fitted when I bought the car must have been a cheapy - it wasn't clamshell and I think half the guts were missing internally.

I think the op will have fun and games in France getting the right spec.

[900xj]

Well, test the sock on a ride, it actually no longer resonates like that, it becomes normal again, and rolls just as well. Except I lost a sacrificed sock on kick down. 😉 Well in any case that gives me the clue to try to solve it. It's a kind of resonance at some rounds per minute. Now find a collar and something to try to block an outing and see what happens when driving. I would have to find something flexible but rigid enough to be able to be put in place like that. Ideas ?

[900xj]

Well, it needs to be optimized and tested again but in the meantime I put some motorcycle exhaust refill (a sort of fireproof glass wool) in the right tube (I made a small tight roll of around fifteen of centimeters pushed in but removable if necessary), drilled two small holes in this outlet and passed an iron wire to make sure that the wool does not escape.

Apparently it doesn't move or at worst would be stopped. (200 km like that)

Result, well already visually without really leaning under the bumper and looking specifically there, it is not visible at all.

In use, the noise is now very pleasant, quiet and if I press you can still hear that it is a noble V6 which starts well. Perfect. Am I losing performance? That remains a bit mysterious. Not really the impression but with less noise it also plays on the unconscious and the placebo effect.

In any case in terms of driving comfort it's a joy (less noisy, almost silent at 90, light at 110, beyond that I didn't have much chance on my journey apart from a few kick down points to see if it was going well and that the wool remained in place).

I'm going to try to find a small, flexible and tight galvanized metal mesh to finalize all of this. I have some left over condenser protection and I tried but it is too stiff. Also, i'll try to make a small roll but not closed to still let the gases pass and see if that limits the volume just as well. That would be ideal if it was just a matter of resonance with certain regimes.