Not all mods are created equal.
I am sure different cars/people may rank them differently.
So,lets see it:

How would you rank your mods relatively?

Ranks among my own mods:

Rocks:
1, 10-wire ground
2, PIAA Super Rozza wheels
3, OEM Front Chin
4, Custom Rear Lip Spoiler
5, Blackwood Steering Wheel
6, Carbon fiber Z-tube & Z Engine Cover


OK/So-So:
1. Clear Side
2. Stillen 05 Catback
3, Tint Job
4, Aluminum Pedals
5, K&N drop-in

Sucks:
1/2" ME spacer.

Lost 0.2 second in 1/4 mile after install instantly, measured
using before & after G-timer. The max accelerating g-force went from 0.22 to 0.21g, when doing WOT at 76 mph trigering down shift.
The only saving grace is that it made my stillen a little less loud.

maybe u have a little too much air flow, ive seen this problem before with previous people opening air flow too much. it really doesnt help unless ur going f/i

love:
Borla True Dual Cat Back Exhaust
Xerd Long Tube Headers
Stillen Sway Bars
Eibach Springs

so-so:
Grounding Kit
Z-tube
Md Spacer
K&n Drop In Air Filter

review Coming Soon:
Crank Pulley
Electric Fan Conversion
Technosquare Ecu Reflash
(cant Wait!!!)

Ma_sha1,
Your 2005 G35X is it a 6MT, 298HP motor? The 2005 lower plenum, for the 298HP motor, has
been redesigned. The spacer has been proven not to add any performance.

If you have the 280hp motor try resetting the ECU.
I gained 15HP and 17 FT-LB with my 1/2" spacer and Iso Thermal kit. I was shocked with the gain. You can feel it throughout the entire RPM range.

https://g35driver.com/forums/showthread.php?t=71191

G35X doesn't have the 6MT option. He's the 280hp engine.

I'm quite happy with all my current mods.

• Stillen CAI with JWT Air Filter - Insulated
• 350Z Air Duct - Insulated
• Crawford V5 & Cast Plenum
• Internally Polished Upper & Lower Plenums
• Modified Lower Collector
• Motordyne ½” IT Spacer System
• 350Z Engine & JDM Covers
• GordGee's 10-wire Ground Gear System
• TechnoSquare ECM Upgrade
• Stillen Cat-back Exhaust System
• Stillen AT Valve Body Upgrade
• Edge Racing - Street Edge Torque Converter
• B&M ATF Cooler
• 350Z (170F) Thermostat
• Dual Electric Fan Conversion
• RacingBrake Big Brake Kit
• Goodridge Stainless Brake Lines
• Stillen Anti-Sway Bars
• Enkei RPF1 Wheels & Toyo TR1 Tires
• Optima Red Top 34R Battery
• Dynamat Sound Deadener

DaveO

Mods I love:

SF Challenge Wheels
Greddy TT Kit
HKS SSQV
Solo Baric L7 Sub
FoCal K2's
Pioneer AVIC-D1
Alpine Visor Monitors
Greddy E-01

So So:
Nvidia G200 Exhaust
JL Audio 300x4 amp
JL Audio 500x1 amp
Greddy Turbo Timer
Varad LED's
RC 660cc Injectors

Not So Happy With:
Greddy RS BOV
Tein S Tech Springs
FoCal 180w 6x9's

Ma Sha1,

When you opened up your plenum could you tell if you had the 287 HP plenum or the Revup plenum?

Can you post a picture of the front of your plenum? All you need to do is remove the engine cover and I can tell you which it is.

Worthwhile mods:
3/8" Motordyne spacer
high flow cats
Z tube (just barely)
V1 radar detector with remote readout

Questionable mods:
grounding kit

GOOD:

Volk wheels
Stoptech Brakes
tint (gotta love privacy!)
cai = whistle is kinda cool i guess..
philip bulbs

SoSo:
Fuji exhaust (that i use to have)
tein s-tech springs
front chin spoiler that cracked on me!
plenum (didnt feel much of an increase)

Ive pretty much sold everything I thought wasnt great. Im happy with EVRYTHING now.

SoSo mods for me:
K&N drop in filter - feels same as stock filter

ROCKS (loving it!):
1. CarPC w/ DigitalWheelz touchscreen
2. Audio system upgrade
3. MD 3/8" Spacer w/ thermal management
4. Gordgee 10 wire 5AT hyperground kit

OK (would do again but not a top priority):
1. Alum pedals
2. Clear corners
3. White LEDs
4. Mtec Fogs
5. K&N
6. Rear view camera

SUCKS:
1. nothing so far (been very conservative with the mods)

Rocks:

1-GroundingGear!!! Worked magic in all 3 of my vehicles!
2-New Tires.
3-Hotchkis Sways
4-Kinetix Plenum
5-AC Hepa Filter

So-So:

6000K HIDs
Nismo CAI
Clear Corners

Sucks:

Kinetix Y-Pipe