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Old 11-19-2015, 04:49 PM   #4 (permalink)
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spacemanspif's Avatar
Join Date: Jul 2013
Location: Dirty Jersey
Posts: 748

The New Focus - '07 Ford Focus ZX5
90 day: 32.44 mpg (US)
Thanks: 142
Thanked 205 Times in 149 Posts
I've seen headers with a choke point or venturi built into the collector. I'm not sure if it's a race application thing or if it helps throughout the RPM range but it might be another feature to explore.

Formed Collectors, hand built Custom Collectors, Street Exhaust Hookup Cones, Megaphones

2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014

Cost to Operate Spreadsheet for "The New Focus"

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aerohead (11-19-2015)