Primary Tube : 1.7 " OD
Collector : 2.5 " OD
Flange Thickness : 3/8"
Runner Wall Thickness : 16 Gauge (1.5mm)
2 x O2 Holes , 2 x ERG
this is the ebay headers numbers!!! and i am sorry no dyno comparison!!! just buy it to try and see if they work with the Nismo exhaust...,and believe it or not for my wing works perfectly and when to get hooked second is when you feel more power an more pull.,,and the sound is as much as I like and the money I gave for them was very fair. but other brands can last and be of better quality but for now I feel no difference in quality since they are still where I put them and are not cracked in any way and do the job I want!! I live in Puerto Rico is an island surrounded by sea water and not noticed any marks on the pipe mold with corrosion...
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