There is a German company offering quad exhaust pipes for 125i's (128i's). Just try searching for it. They were super pricey though! Like $2.5K I think. ? The reason why it was so much was bc they also sold you a cf diffuser too!
Some guy with a 135i bought one... he had it on his car for a few days before getting his money back and switching back to OE. The small-er 125i dia pipes killed his mid and top end. lol
I think the company was in the Dortmound/Essen area.
Dack
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