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collector size 2 1/2 or 3 @600 to 700whp?

Discussion in 'Exhaust' started by sean r, Jan 21, 2013.

  1. sean r

    sean r New Member Established Member

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    Dec 5, 2012
    Location:
    norwalk ct
    I have a 2.3 whippled termi @ 19psi with stock manifolds and a pro chamber and borla stingers. Best / newest dyno sheet is 624 uncorrected with new tune right before i bought the car and others in the 570s. I am gonna put long tubes on it and was figuring going with ahr 1 3/4 primaries and 2 1/2 collectors and there catless x. When I just called the to get the part # they really recomended there 3 inch collector and x pipe that goes from 3 to 2 1/2. The car is pretty low with h&r race springs and no isos so im a little worried about ground height and if it really needs a 3 inch collector since its going into a 2 1/2 exhaust anyway?. wondering what you guys with 600+ are running for collectors.
     
  2. sean r

    sean r New Member Established Member

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    Joined:
    Dec 5, 2012
    Location:
    norwalk ct
    Btw the tech i spoke to at arh was very helpfull but said they would rather not build a 1 3/4 header with a 2.5 collector. But on lethals site and lmp they are listed with the 2.5 and the 3 as a option. It does seem that feeding 4-1 3/4 primaries into a 2.5 collector would be a bottle neck.
     
  3. cdnstang

    cdnstang 604 modulars Established Member

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    Jul 28, 2008
    Location:
    Canada
    I"d go with the 3" collector and have it neck down to 2.5" with there x pipe. I just got there 1 3/4 headers with 3" collector and custom built a 3" prochamber and 3" catback. Hopefully its not too loud, i love the way the prochamber sounds on these cars. I originally had the 1 5/8 mac longtubes but when you measure the collectors its 2 1/4".
     
  4. 98 Saleen Cobra

    98 Saleen Cobra Authorized Vendor Authorized Vendor

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    18,800
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    Feb 28, 2007
    3'' collector necked down to a 2.5'' for the catback..
     

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