I'd get it welded, too. I'm actually planning to get the PLM replica at some point, and having it converted from a 4-1 to a 4-2-1. Even if Bisi still offered their own header, I wouldn't want to spend $1000 on one just to hack it up.
But at 2:18 in this video is the exhaust paste I mentioned:
But at 2:18 in this video is the exhaust paste I mentioned:
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