Execution Version
 SECOND AMENDMENT TO
SIXTH AMENDED AND RESTATED
GAS GATHERING AND PROCESSING AGREEMENT
 Amendment Producer Gatherer Processor
 Cowtown Agreement
 Purchase Agreement
    provided
 a.
    
    Processors obligation to operate the Plant in the manner described in the foregoing
sentence is subject to the Gas received at the inlet of the Plant having a daily average Btu
content of not more than 1280.b.
    
    Processor and Producer shall maintain an account (the Ethane Recovery Account).




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c.
    
    Calculated on a daily basis, on such days as the percentage of Ethane extracted from the
Gas (the Ethane Recovery Efficiency) is greater than 90%, Processor shall add to the
amounts already existing in the Ethane Recovery Account the amount of revenues received from
the sale of Plant Products that were recovered as a result of the Ethane Recovery Efficiency
being greater than 90%, less the amount of revenues that would have been received
for the MMBtu equivalent of Residue Gas that would have been delivered had the Ethane
Recovery Efficiency been less than 90%.d.
    
    Calculated on a daily basis, on such days as the Ethane Recovery Efficiency is less than
90%, Processor shall subtract from the amounts already existing in the Ethane Recovery
Account such amount of revenues as would have been received from the sale of Plant Products
had the Ethane Recovery Efficiency been equal to 90%, less the amount of revenues received
and attributable to the sale of Residue Gas with a Btu content higher than would have been
had the Ethane Recovery Efficiency been greater than or equal to 90%.e.
    
    On each anniversary of the Effective Date and the date of termination of this Agreement
(each an Account Clearance Date), if the amount in the Ethane Recovery Account on such
Account Clearance Date is less than zero, Processor shall pay to Producer the amount of such
deficiency within two business days of such Account Clearance Date. Following the
completion of such payment, the amount existing in the Ethane Recovery Account shall be set
to zero. For avoidance of doubt, on any Account Clearance Date, no party shall have an
obligation to pay under this Section 2.4(e) if the amount in the Ethane Recovery Account on
such Account Clearance Date is greater than zero.f.
    
    Upon written request from the Producer, such request to be made contemporaneously with
the nominations made pursuant to Section 6.2 below, Processor shall reject Ethane contained
in the Gas delivered at the Plant Delivery Point(s).
   2




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Signature page follows.
 3




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QUICKSILVER RESOURCES INC.By:
    /s/ Glenn DardenName:
    Glenn DardenTitle:
    President & Chief Executive
OfficerCOWTOWN PIPELINE PARTNERS L.P.By:
    Quicksilver Gas Services OperatingGP LLC, its general partnerBy:
    Quicksilver Gas Services OperatingLLC, its sole memberBy:
    Quicksilver Gas Services LP, itssole memberBy:
    Quicksilver Gas Services GP LLC,its general partnerBy:
    /s/ Robert G. PhillipsName:
    Robert G. PhillipsTitle:
    President Signature page to Cowtown GGPA Amendment




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EXHIBIT E
 TAKE-IN-KIND PROCEDURES
 TIK Procedures Agreement
  Designation of Volumes at Delivery Points
 Producer Responsible for Transportation Arrangements
 Balancing Accounting
 Balancing of Deliveries
 Producer Responsible for Payments




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Assignment.