I went buy some cheap headers no name brand I just wanted it more for a better look then just stock and don't have 200 plus cash layin around for some dc's or anything else...well I got 4-1 I don't kno the difference between 4-1 and 4-2-1 what's the difference...and also its a 2.5 inch but I didn't kno my pipe is a 2 inch and it didn't fit so I cut my pipe and I weld it to the headers not sure if this was a good idea can some one let me kno if I did good by doing that ?? Thanks