hi i currently have a 2009 g37s coupe 6speed with stillen gen3 intakes,and ark grip catback exhaust,i am trying to get a deeper louder sound with out changing the tips, any help on what i can go with?long tube headers?headers with HFC,or change from X pipe to Y pipe?or maybe i do have to change the tips only but not sure if other brands will bolt on to the ARK pipes?

 

FI RHFC's claim to deepen the tone.

 

Hfc or tp will do the trick.

 

HFC's like everyone else said will do the trick