I am the new owner of a 2004 G35 Coupe 5-AT. I want to do some minor mods to pick up some HP. What did they do to increase the HP in the 2005MY?

I've read that the Z-Tube and pop charger alone do nothing for the useable HP and Torgue numbers. Is this correct? What if I add the 1/2" plenum spacer? Does this provide an increase? Has it been proven on the dyno? The website says 10-12HP with the plenum alone. That seems unlikely, but does anyone have proof with dyno runs?

I read a post of a 2005MY that actually lost power when installing this setup. Is that because of changes with the '05 versus '04?

Thanks for your feedback. I don't want to throw money away on a combination that won't be noticable.

Joe

 

The JWT pop charger showed a 6.5 whp increase according to their dyno chart. Realistically; you could see a 2-4 whp increase from that mod alone. The Z tube wouldn't really net you any gains if you were running only bolt ons. The 1/2" plenum spacer would give you about 4-6 whp increase. Therefore I would say you would make anywhere between 6-10 whp with these 3 mods.

 

The 1/2" spacer has been said to get around 11-12 hp gains at the wheels.