I'm thinking about buying :
a DC Sports header
(http://www.gravanatuning.com/applications/2005_Pontiac_Sunfire_Coupe_2.2_16v.aspx/2/405/_Header_DC_Sports_Ceramic_Coated_Header_Coming_Mid_January_)
and a Magnaflow Cat
(http://www.gravanatuning.com/applications/2005_Pontiac_Sunfire_Coupe_2.2_16v.aspx/2/193/_Catalytic_Converters_Magnaflow_Carsound_OBD_II_Stainless_Hi_Flow_Cat).
What do you think about those 2 things, let me know if you have something better. I have a Vibrant Exhaust (2" 1/4) that start after the cat so I need something of the same size.
this one (they say : The primary tubes are 1-1/2" with the collector tube at 2-1/4".)
and the cat (it's 2" 1/4)