Come over to floridaspl.com. There are a couple of different places that can do and have done what you're asking for. Some of those people are on here, but mostly over there.
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I used to have that walled Challenger, then it got totaled...
2015 IASCA Welterweight Champion and Record Holder - 156.0 Avg (No door blockers)
2016 IASCA Welterweight Record Holder - 157.7 Avg (Door blockers used)
Team Sundown Audio & Fullriver Faction Member