I have a 2006 G35x Sedan. I don't want to go forced induction. I've done all the bolt ons, Kinetix V+ Intake Manifold, z tube, K&N filter, Hi Flow Cats and Stillen Cat Back exhaust all rounded out with an Uprev tune. So I've searched all over the site but I haven't seen anything about porting/polishing/replacing heads, stroker packages, cams etc. Cost (within reason lol) is not a major problem. What have people done going this route?

Hugh Maguire

 

It's pretty much maxed from factory, you'll spend tons of money for little gains. Either go forced induction or buy a faster car...

 

Weight reduction, underdrive pulley, lightweight wheels, 2 piece rotors. Don't know if there is an aluminum driveshaft option for the sedan but you could take measurements and have one custom made.

 

I'm sure headwork, increasing compression, cams, etc would help but might not be cost effective. Apparently about all you can bore/stroke the 3.5 to is 3.8 liters.

Interesting article here: http://www.superstreetonline.com/fea...hop-challenge/

 

Stroker kits go to 4.2L

 

Put NOS on it

 

Maybe the 3.8 displacement was what was achievable at the time, or maybe there were technical reasons they went with a particular bore and stroke?