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So no one has cut open a PE or 335is exhaust yet? It would finally give us an answer.
That being said, I'm thinking the best bet is what Conrad suggested above - solid pipe for portion B with full packing, and reduce packing around portion A.
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| 335i coupe | Monaco Blue | JB4 G5 ISO | Style 313M | Huper 40% tint | Aero lip | CSL trunk spoiler | M3 sideskirts
| Paint-matched grilles | Painted reflectors | GP Thunder II angel eyes | Smoked LED sidemarkers | Self-coded | |