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tholyoak · 08-05-2008, 06:25 AM

I guess I am feeling a little more charitable today so I will give you some more details against my better judgement.

You are making the same, possibly incorrect assumptions about header design as I made. I too liked the longer primary design of B&B headers and assumed headers like the Fabspeed were made with short primaries to accommodate cats even in their headers without cats.

Upon comparison the B&B fabrication is not up to the standards of Fabspeed, the B&B use a stepped primary, which is far cheaper to manufacture and their collector design is not as neat of a piece as the one peice 'F1' merge collector on the Fabspeed.

I have dyno tested the B&B and will dyno the Fabspeed that is now on the car this weekend as long as the dyno shop is open. The butt dyno says there is no appreciable difference between the two header designs, simply they have went about the process in two different ways, but we'll see what the dyno says.

A crappy cell pic of the B&B headers

-Todd

08-05-2008, 06:25 AM	#21
tholyoak Registered User Join Date: Jan 2006 Location: Glen Allen, ON Posts: 314	I guess I am feeling a little more charitable today so I will give you some more details against my better judgement. You are making the same, possibly incorrect assumptions about header design as I made. I too liked the longer primary design of B&B headers and assumed headers like the Fabspeed were made with short primaries to accommodate cats even in their headers without cats. Upon comparison the B&B fabrication is not up to the standards of Fabspeed, the B&B use a stepped primary, which is far cheaper to manufacture and their collector design is not as neat of a piece as the one peice 'F1' merge collector on the Fabspeed. I have dyno tested the B&B and will dyno the Fabspeed that is now on the car this weekend as long as the dyno shop is open. The butt dyno says there is no appreciable difference between the two header designs, simply they have went about the process in two different ways, but we'll see what the dyno says. A crappy cell pic of the B&B headers -Todd __________________ Current Cars: 1989 911 Targa 1984 944 Original Owner 1971 911T Last edited by tholyoak; 08-05-2008 at 06:35 AM.