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I Have an 09 g37s coupe what's the best intake and best sounding ?
That's hugely subjective. Most Intakes sound pretty good at WOT over 3k rpm, the true cold air intakes tend to get some HP gain at higher rpms. Most will lose a bit until 3k rpm and will gain over 3k. The Stillen Gen 3 seem to get the best gains overall. It's all about your budget, for a low budget the Injen, K&N and R2C will give good sound and higher RPM performance. I'd search the myriad of threads on Intakes in this folder for more help.
