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first off, what is your current body kit/theme on your car? It really depends on how your overall look is right now. I love HKS350's rear diffuser and was about to do the same but realized it was way to aggressive looking for my current setup.
We have some more pics of local ISx50 owners with our diffuser if you want more pics or info, feel free to drop me a PM!
As with anything dealing with looks, it's always subjective so do what you like and not what others tell you! If I followed what the norm was my IS-F would never have developed into it's current stage of mods and few who have seen it will dispute it's aggressive nature!
here's an IS350 and my IS-F both sporting the same diffuser:
the IS-350 has the Tanabe exhaust if I'm not mistaken: