Why not just mount the exhaust system on top of the car instead of under it? Put a hole in the hood and run the headers up instead of down. That should at least make the demon bolts easier to access if you ever change out the cats.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |