D15, D16, D17 and Mini-Me swaps
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By hatchin06
#104834 I wouldn't. Just go to your local auto parts store. Should be no more than 20 bucks.
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By chrono404
#104839 I used my Stock Header Gasket for my Aftermarket Header. Have yet to have a problem. The after market header has been taken off and put back on multiple times for misc things, such as replacing blocks and transmissions.

No Issues yet.
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By suspendedHatch
#104959 Yes, absolutely. Just hold it up to the header and make sure it doesn't overlap any of the ports. That's all there is to it!