07-07-2006, 08:29 AM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
I went with 1 7/8" primaries that step up to 2" into the side pipes and the collector is 3 1/2".
I went the larger 1 7/8" because I thought I might supercharge the motor later. I reckon Phil has the ideal for a Naturally aspirated LS1 with the 1 3/4" as they will give pretty good all round performance with room for upgrades like a cam and heads.
Cheers
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Mike Murphy
Melbourne Australia
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