i bought a tdi mk4 golf that an idiot had modified to be straight pipe all the way out
so i'm looking at needing to install a catalytic converter and muffler.
any recommendations for what type of cat works best with our engines?
Most other tdi forums are full of folks talking about cat deletes and mufflrectomies...
... i know the ecomodder crowd is into efficiency, so here's hoping someone has some bright ideas about the best cat for an mk4 tdi.
thanks for your knowledge!