I want to change my exhaust piping to 3" on my E4 from the downpipe to the CAT. My question is can i buy the below items on ebay and be able to change the piping without any to little modifications as possible?

Turbo Outlet: http://www.ebay.com/itm/310067713078...84.m1423.l2649

Downpipe: http://www.ebay.com/itm/250406548940...84.m1423.l2649

Replacement CAT: http://www.ebay.com/itm/230502763129...84.m1423.l2649

Will these items work on my evo4 to replace the stock piping before the CAT?

 

You've got all the right pieces parts but they aren't specific to an E4 so im not sure about fitment.