Built this CAT Back exhaust today on a Audi A4 2.8l V6. Magnaflow 4"x9" oval muffler with the same side offset inlet/outlet. Magnaflow dual layer twin round angled tip. 2.5" exhaust pipe post CAT(s) all the way to tip. This came together really well and thankfully we were able to get all the parts today from our suppliers. Stock exhaust is so rediculously over engineered and it weighed a metric ton! Two mufflers stuffed under that car. We shaved near 15lbs of exahust on that thing. Sounds really really good too, very Euro V6.