so I think I've gotten it straight. I'm trying to finish my full exhaust mod and I'm confuse. From the manifold you get the dp, test pipe, center pipe, and axle back? or am I missing something between the dp and to?

 

dp - testpipe - axleback

 

so why does this dp look different then the others?

http://www.evasivemotorsports.com/me...hi_EVOX_Intake

 

That one doesn't have the o2 housing like this one:

http://www.amsperformance.com/cart/A...-Downpipe.html