Size seems ok to me (on 4K monitors tho). Your best bet is to resize the photo and then upload it again and link the new resized photo. I generally use the old school MS Paint for basic editing like resizing or rotating.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |