First I would like to say that this site has helped me a lot in making decisions on what mods to get, and overall extremely helpful in learning more about this car.

Next, what is next for me as far as NA mods? I have pretty much all the common mods one can have (correct me if I am missing any basic performance mods). I have the following mods in the order listed below:

Ztube + JWT PC
MD 3/8" spacer
Injen SES Exhaust
GroundingGear
Helix Test Pipes
TopSpeed Pro-1 Headers

What other mods would benefit performance? U/R Crank Pulley? TechnoSquare Reflsh? Are any other mods worth the price for the gains they will produce going NA?

Any comments or suggestions would be great, Thanks.

 

Injen exhaust has been known to spit out fiberglass. You might want to consider another as I'm not sure it's been addressed satisfactorily from the manufacturer. Def go for the 10-wire grounding gear with your AT. Crank pulley does help with torque and response but you will open a can of worms discussing it. I have one but do a search on all that's been talked about. For the intake you may want to just get the K&N filter with the stock intake or maybe the Stillen paticularly if you're in a warm climate. I have the PC but will probably swap back to the stock intake and K&N for summer.

You don't say what year G you have. From what I've read gains for the plenum spacer on 05s has been inconclusive although I think there was a big dyno day coming up where some 05s were to be tested. Search. Technosquare thing seems to be hit and miss IMO and a pain to get done. Don't know enough about the other mods you mentioned but hi-flo cats seem to be a good addition as well.

Don't forget suspension. Sway bars, tires, springs, etc will help you put the power to the ground.

 

I haven't had many problems with my Injen exhaust as of yet.

I am also pleased with the Ztube + JWT PC, and don't see the need to replace that either.

The one thing I am considering replacing is the MD 3/8" spacer with a Crawford plenum. Does anyone think the gains from this would be worth the replacement?

My car is a 2004.5 G35C btw.

 

Nope, best mod bang for buck is FI

 

I heard that the new kinetix ssv intake manifold provides almost ~30rwhp on N/A cars. But its alot of money.

 

I'd suggest K&N filter to go along with your intake, and synthetic oil for engine and rear gears.
C.

 

He has an AT - The '05 5ATs have the same engine (and lower plenum) as previous years. Only the 6MT with 298HP has the redesigned plenum that is showing mixed results for the spacer. Easiest way to remember: Any car factory spec'd @ 280hp should benefit from the motordyne spacer.

--Viral

 

I have read several reviews on the new SSV by Kinetix, and most say that mainly the FI guys are showing huge gains, so it wouldn't benefit me much because I am running NA. Someone feel free to correct me if I am wrong, I wouldn't want to be responsible for starting any flame wars.

I have been running with the JWT PC for some time now, and am reasonable happy with it. Though I do notice a slight decrease in power when I first had it on in the lower RPM range, that is not an issue anymore considering my other mods. I have also been running fully synthetic oil since break-in.

I am trying to avoid going FI for now, but sooner or later it's going to happen.

 

u actually lose power (low end) on the kinetix ssv. gains are only noticable on higher rpms. have u considered valvebody or torque converter with trans cooler.

 

Thanks!

 

I have not considered that, I will do a quick search to check out the benefits. Thanks for the suggestion.

 

The UR Crank Pulley is a good mod that isn't very expensive. I haven't had a dyno, but there appears to be quicker acceleration and pull throughout the rpm range. I'm also pleased with the 3/8" plenum spacer.

 

I can not believe no one has said to go with the 350EVO 3.9 final drive gearing. DO not do the ECU reflash until you are done modding. The reflash should be your last mod.

 

agreed. read this thread, too:

https://g35driver.com/forums/tuner-dyno/56813-visit-technosquare-ecu-reflash-pics.html

my recommendation: Stillen Valve Body upgrade. go look for it on www.stillen.com

 

I thought plenum spacer was only good for 03s?
or was it 04-05s that needs it..