Yeah those keystones look difficult with those switchback angles - I had difficulties even with 90 degree angles on some T-bars. The loom is bulky and I would be worrying about damaging the insulation pulling it around those angles - there may be sharp bits in the inside welds.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge