hello! I've been lurking for a little while but decided to go ahead and join. So, hi to everyone - I've already benefited from everyone's posts on plenum spacers, etc.

My G - 2004 G35x Sedan I've owned since new, 38K mi, auto, pretty well stock except for a (new) Stillen cold air kit. I'm looking forward to putting on a plenum spacer, new exhaust and ??? What do you recommend?

I've got a big-a** sub and amp I could put in my car but why? What do you think?

 

Wlcome to Driver! for the spacer get the MD 5/16 Spacer. idk sedans but i think the HKS is a good exhaust i think it just may be a tip tho