Quote:
Originally Posted by UPSROD
How can I explain this any better...there are NO HOLES in the mufflers! There is TUBING welded THROUGH both mufflers (tubing is hollow) therefore the holes. The tubing re-enforces the mufflers preventing repeated expansion and contraction causing the cans to crack in some cases!
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Interesting, thanks for sharing. I was a bit surprised that BMW would just drill a hole like that, as it would drastically change the sound of the exhaust, among other things.