Im lookin to get a header cat and exhaust for the gsr...I was thinkin DC S.S. 4-2-1 header with carsound cat and apexi dunk exhaust...i have a question about all of these components...does the DC header end in 2.5 cuz i want to have 2.5 exhaust all the way thru? thank u for the help

 

The DC 4-2-1 does not have a 2.5" collector

the JDM DC 4-1 does

Thinking about it, the only headers I know of that are 4-2-1 and have a 2.5" collector are hytech and SMSP.. which are more of a hybrid header than a traditional 4-2-1.