Ive got a 2008 g37s coupe and im looking to buy an exhaust, whats the best sounding one??

 

Sound is subjective. Some like loud and obnoxious. Others prefer tame and quiet. There is no "best" with something based on an opinion.

 

Hey I've got 2012 g37s coupe 6 speed manual. I had my muffler removed and had straight pipes installed. It sounds amazing from day one and I've had it like this for 8 months now. I think ud be surprised with the results if u do this. I've had people drive up next to me and telling me what an awesm sounding machine I've got. The whole job costed me $350. That included removing the muffler, making
Custom pipes and welding on new chrome tips. Give it a shot!

 

Please search in the intake & exhaust section, there are hundreds of threads on different exhaust setups. Asking for a best exhaust sound is like asking for a best color, it's subjective.