I'm not sure what material the HKS DP is made from, but the AEM WB sensor came with a mild steel weld-on bung.  Anyone know if the HKS DP is mild steel?  Also, whats my best (cheapest) bet for getting a shop to weld this on?  Should I just go to a muffler shop?  About how much should I plan on spending to get it welded?
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