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will going from a 3" bore to a 2.5" exhaust bore increase backpressure?

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Old 17-08-2008 | 05:13 PM
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Question will going from a 3" bore to a 2.5" exhaust bore increase backpressure?

as title, i know it sounds thick but am extremely hungover today!
Old 17-08-2008 | 05:14 PM
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i would of thought so mate
Old 17-08-2008 | 05:15 PM
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Technically yes, the more relevant question is 'by how much?'
Old 17-08-2008 | 05:16 PM
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Yes, it's when you go the otherway you'd be ok..
Old 17-08-2008 | 05:25 PM
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ive got a straight through mongoose with only back box its 11years old and doesnt have much baffles left in it,its loud as fuck

and it is still restricting my cars power,everytime its on the rollers it blows the gas anyliser over,and its on an axle stand
Old 17-08-2008 | 05:58 PM
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thanks guys just measured my scorpion system with a tape, its roughly 22cm all round, so what bore would it be?
Old 17-08-2008 | 06:18 PM
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2.5" bore then...
Old 17-08-2008 | 06:20 PM
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just measured my standard ford exhaust and thats a 2" bore only!
Old 18-08-2008 | 02:22 PM
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Originally Posted by paceo
thanks guys just measured my scorpion system with a tape, its roughly 22cm all round, so what bore would it be?
Diameter = Circumference divided by Pi

22cm / 3.142 = 7.00 cm = 2.75 inches
Old 18-08-2008 | 04:38 PM
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Originally Posted by cozmeister
Diameter = Circumference divided by Pi

22cm / 3.142 = 7.00 cm = 2.75 inches
thanks mate, id imagine about 2.6 because i have to take in the thickness of the steel!
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