Performance Cast Plenum
Questions & Answers
Applications: Nissan 350Z
- Infiniti G35c - Infiniti G35s - Infiniti FX35
Understanding the Crawford Plenum
CLICK HERE for a video from Doug himself explaining this modification.
What is the advantage of the Crawford intake plenum over the stock
plenum used on the Nissan 350Z and Infiniti G35 and FX35?
The stock plenum, due to the slope towards the front, which Nissan designed to clear the stock strut bar on the 350Z, restricts the airflow to the front cylinders. Our design raises the front of the plenum as shown in the picture below, allowing more surface area and greater, equalized airflow to all cylinders. Greater airflow equals more power. On average, our plenum produces an increase of 9 hp at the original peak, and a solid 17-20 hp at redline.
What type finish is available?
All plenums will be powder coated with a black "crinkle" finish as shown.
Can I use my factory 350Z front strut bar with this plenum?
No, it will not clear the front of the plenum due to the increased height. However, w e do offer our own strut bar that fits in front of the plenum for $150 plus shipping . It is a straight aluminum rod connected by adjustable heim joints to powdercoated steel flanges and it comes with all hardware required for a simple bolt-on installation. Our tests indicate greater strength than the factory bar due to the fact that the factory bar is not straight (it is "pre-bent").
See picture for an installed front bar.
NOTE: Strut bar will NOT fit the G35
or FX35, neither of which come with a stock bar.
Can I use my stock, plastic engine cover with your plenum?
Yes, with some cutting, it can be used.
Here are examples of earlier versions of our plenum and a "Dremel tool-cut"
cover and our strut bar (note the thickness of the flanges)
Crawford Headers 
