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Much Difference?? 

 

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 Post subject: Much Difference??
Posted: Sun Jun 18, 2006 11:41 am 
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I have a 2.5 inch system currently on my car was wondering if i put in another 2.5 inch pipe will that free turbo backpressure or will i have to upgrade to a 3"???

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Posted: Sun Jun 18, 2006 3:04 pm 
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you means twin 2.5s???

if so, then remember the cross section of twin 2.25's is equivalent to nearly 3.5inches. 3in has less flow ability than twin 2.25's...

so i imagine twin 2.5s would flow really well

 

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Posted: Sun Jun 18, 2006 3:48 pm 
Getting Side Ways
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Ta thats what i figured but thought id ask to be sure :)
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Posted: Sun Jun 18, 2006 5:40 pm 
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just fired up the calculator, it tells me that cross section of twin 2.5s is bigger than single 3.5in

63cm2 vs 61cm2

 

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EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI

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Posted: Thu Jun 22, 2006 6:21 pm 
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I was gonna do this to mine... grab another 2.5in cheapo lukey cat back and mount it next to the existing lukey pipe... would be a cheap alternative to changing to a whole new 3.5in system, and more flow to boot
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