K&N Performance Air Filter Panel 33-2031-2 - 350Z DE 03-06
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33-2031-2 · K&N Performance Air Filter · Panel Washable & Reusable VQ35DE · 350Z DE 2003 to 2006
K&N Performance Air Filter Panel 33-2031-2 – Nissan 350Z DE
33-2031-2 · VQ35DE · 2003 to 2006
The K&N 33-2031-2 is a washable, reusable high performance drop-in air filter for the Nissan 350Z DE equipped with the VQ35DE 3.5L V6. It sits directly in the factory airbox in place of the standard paper filter no modification required. Unlike a disposable paper filter, the K&N cotton gauze design flows more air into the engine while maintaining effective filtration, and can be cleaned and re-oiled rather than replaced at every service interval.
The 350Z's VQ35DE is a free-revving naturally aspirated V6 that responds well to improvements in intake airflow. The K&N 33-2031-2 reduces intake restriction compared to a standard paper filter, helping the engine breathe more freely across the rev range a simple and cost-effective first step in extracting more from the VQ35DE.
Product specifications
| Specification | Detail |
|---|---|
| Part number | 33-2031-2 |
| Brand | K&N Engineering |
| Type | Performance air filter flat panel |
| Filter material | Cotton gauze |
| Filter shape | Panel |
| Outside length | 279 mm (11 in) |
| Outside width | 167 mm (6.563 in) |
| Height | 29 mm (1.125 in) |
| Re-oiling amount | 31 ml (1.06 oz) |
| Reusable | Yes — washable and re-oilable |
Why K&N
- Direct drop-in fitment into the factory airbox no modification, no adapters, installs in minutes
- Cotton gauze construction flows more air than a standard paper filter, reducing intake restriction and supporting improved throttle response and power delivery across the rev range
- Washable and reusable clean with K&N filter cleaner, re-oil, and reinstall rather than buying a replacement filter at every service
- Maintains effective engine protection by capturing fine particles while allowing high airflow the cotton gauze layers trap contaminants without the restrictive effect of paper media
- Designed specifically for the VQ35DE airbox precise fitment ensures no air bypass around the filter edges
- Made in the USA by K&N Engineering, the originator of the oiled cotton gauze air filter
Installation
Difficulty
DIY friendly
Install time
Under 5 minutes
Tools required
None
Clean interval
Every 80,000 km
Fitment
Nissan 350Z Z33 DE · 2003 to 2006 (VQ35DE)
Infiniti G35 Sedan · 2003 to 2006 (VQ35DE)
Infiniti G35 Coupe · 2003 to 2007 (VQ35DE)
Fits the VQ35DE airbox only. Does not fit the 2007 to 2008 350Z HR equipped with the VQ35HR engine. Confirm your engine code before ordering.
The K&N 33-2031-2 is the most popular performance drop-in upgrade for the 350Z DE airbox. Works with the factory airbox and all factory intake components — a clean, reversible performance addition that complements a tune or works equally well on a stock VQ35DE.
