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Fluellen · 03-25-2011, 08:51 AM

How small do you want the primary diameter to be?

I have M2 (ebay) headers; they have a 42mm primary OD. This seems a pretty reasonable primary size to support a 250-280 hp car.

I guess you could increase midrange torque a bit by going to a slightly smaller diameter.

03-25-2011, 08:51 AM	#4
Fluellen Doc Join Date: Jul 2010 Location: SoCal Posts: 69	How small do you want the primary diameter to be? I have M2 (ebay) headers; they have a 42mm primary OD. This seems a pretty reasonable primary size to support a 250-280 hp car. I guess you could increase midrange torque a bit by going to a slightly smaller diameter.