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hx40w

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    Other CUMMINS COBRAHEAD DOWNPIPE

    CUMMINS™ COBRAHEAD DOWNPIPE “RARE” This CUMMINS™ design is tried and true for performance gains in fact FORD™ uses it on their later Powerstroke™ and claim a whopping 30+ HP gain over conventional mandrel formed down pipe. This CUMMINS™ COBRAHEAD downpipe “can be used for tight turns in many...
    • FellowTraveler
    • Thread
    • 4" exhaust cobrahead holset & cko hx super 40 hx40 mods hx40w mods turbo
    • Replies: 7
    • Forum: For Sale
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    Boost issue!

    Strange boost issue w/HX40w 18 cm2, normally starts to spool at 1.1k I have boost set to 30 psi (gauge) on a hot day it will boost a little less and on a cool day it would spike a little higher upon initial throttle to WOT there would be a very noticeable cloud of black smoke which would clear...
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