my cousin and i made this. its bolt on. i can feel a huge difference.

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looks good.
If you could have made the section more outward, it could probably could also serve as a harness bar.

My friend recently put a bar at his b-pillar on his supra *yes the b-pillar where his seatbelt hooks are..*..i would never put one where he put it. but I like yours.

 

looks good. great idea

 

nice creative work looks good.