I currently own a 2008 G37s with a catback Stillen exhaust and resonator delete and Stillen cold air box. For the most part it sounds good until I rev it to 5grand and it has that tinny noise nobody likes. What would you recommend to give the car that VQ trumpet sound while removing that tinniness? Would it be an axle back exhaust, not to sure.

 

Jut to clarify, you cut off/removed the resonator in the Stillen cat back exhaust?

 

Yes I cut out the resonators

 

I see... I have no idea how to get the sound you are looking for.
Worst case, you can always put back the resonators to remove the tinniness sound.