If there is nothing wrong with your standard engine cover then I'd keep it as is tbh. I mean from the picture it looks good and the "V6 3.5" still look's like new.
I only changed mine in the end because it had cracked from being cut to accommodate the pulleys, the "V6 3.5" logo was worn and then to top it off I lost my "NISSAN" badge so I thought f**k this.
Was lucky in the end because Chris gave me a good discount on the carbon fibre cover and my Dremel skills modified it perfectly to fit around my SC pulleys.