Since we don't have a weld or fabrication section to post in... I'm trying to build my own manifold and need to make the merge collector for a T4 non divided.   I have made a merge collector for a T3 flange just as a starting point, but I'm struggling with the cut angles of the T4 as it is larger and rectangle shaped.   I did alot of searching and everything I'm finding is for the 4-1 T3 or 4-1 T4 divided. Nothing on the non divided.   any help would be great.

Roughly about how much would it cost to have a flex pipe and wideband bung welded on at an exhaust shop? I know a lot of people here have had both done so averaging what would it cost?

http://i1187.photobucket.com/albums/z388/starionkiller/parts%20for%20sale/th_2013-11-24175442.jpg   Here is a pair of the pesky door swithes that loose there ground connection and make your seatbelts not work. Clean these up and install them  

http://i1187.photobucket.com/albums/z388/starionkiller/parts%20for%20sale/th_SAM_2206.jpg