Fantastic looks - now needs an exhaust to make it sound like it looks! I have built my jig from the factory system. The manifolds are the same as previous models with their log-design and integral catalysers. The downpipes (Y-pipe) are the later 4** series layout/diameters but have a different final section with a 3-bolt flange to fit to the '3rd Cat'. First step is a dyno-run with the factory exhaust fitted before I start the mods.