You forgot the oportunity costs of destroying a stock wastegate muffler. 
Anyhoo, you learned a lot and didn't burn the house down (my welding education has been much more colorful). I can still set you up with one of these should you decide to remove the remnants of the stock unit.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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