Hey guys I have both a Plog and SD headers so I decided to grab some calipers and do a quick comparison for people since this question comes up constantly on which is the best route to take.
Primaries and Crossover Measured by OD
SD Front Header= 1.650
SD Crossover= 2.250
SD Rear Header= Still on car haven't measured it yet
SD Downpipe is 3inch
ZZP Plog= 1.650
OEM Crossover= 2.012
OEM Rear Manifold= 1.506
The outlet on the rear manifold measures 2.575 ID
Hope this helps people when deciding what route to take
