once the headers are tacked, you leave collectors off and make a peice to weld in th emiddle of the 4 tubes, you also weld where each tube comes together, so once collector is on there will be no leaks
speedway motors has a 4-1 header kit for 169.99 its 18 ga but well worth the money, you may need a few 45's more however 45 are like 10 bucks each
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