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im not sure here but i dont think they have a different bolt pattern. i have heard of people using 03-06 headers on 07 and up Z's but they have to use 03-06 stock cats/hfc or test pipes
How about those Ebay Magnaflow 4" cats? Think those would work with an HR? Yeah we'll have to put O2 bungs after the cats, but any reason those wouldn't work, assuming of course we welded in the appro-po piping?
im not sure here but i dont think they have a different bolt pattern. i have heard of people using 03-06 headers on 07 and up Z's but they have to use 03-06 stock cats/hfc or test pipes
they have different flange, different gasket types too from 07 + vs 03-06
