Heat.
But it will probably mess up the finish. The temperatures and specific process used by some companies to create the burnt look are closely guarded secrets and not easily replicated from what I've seen.
__________________
2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed |
|