07 Honda Fit WR Street Header Install
Car : 2007-2008 Honda Fit 1.5L
Header : Weapon R Street Header
Tools needed :
14 mm
12 mm
10 mm
Ratchet
Item showed up not long after delivery was confirmed.

Item still in package

Package opened to reveal header
Step 1 :
This step is optional but highly recommended.
While the engine is cooling, spray all bolts with some WD-40. It will eat through the rust and will make your job easier.
Step 2 :
Remove Heat Shield.
This shield is held in place by 3 bolts (10mm). They are easily accessible from the top.
Note that this shield will not be reinstalled with the WR header so it doesn’t matter if you break a bolt !

This shows where all the bolts are

Heat shield once removed
Step 3
Remove Header.
This step is very easy once you know how to reach each bolt. There are 2 bolts (14mm) on the top part of the header and 3 bolts (14mm) on the bottom.
The 2 top bolts are easily accessible from the top of the car.
The bottom bolt on the passenger side is accessible from the bottom of the car
The bottom bolt in the middle is accessible from the bottom of the car
The bottom bolt on the passenger side is accessible from the top of the car.
Since these bolts will be reused, it is important not to break them. We recommend heating them up using a blowtorch or some sort of heating device.
It is recommended not to completely unscrew the bolts right away. If they are removed right away, it will put excess stress on the 2 spring loaded bolts that connect your header to the downpipe.
Once you have loosened the five header bolts, it’s time to remove the 2 spring loaded bolts (14mm) that connect to the downpipe.

Once again, these bolts will be reused so be careful with them !!!
PS : You unscrew them from the spring side (as shown in picture)

One bolt off !

View from the top
As you can see, these bolts are pretty rusted so be careful
Step 4

It is now time to remove the O2 sensor.
From the top, you can locate a yellow wire connecting into your header, this is your O2 sensor. Follow the wire (it should be going to the driver side). You will see a black connector. Unplug it.
Your O2 sensor is now disconnected

You can now remove the remaining 5 header bolts. We recommend removing the lower three first.
Be aware that once all screws are removed, the gasket will fall. Be sure to catch it !!!
Here are some pictures ,

Stock header

Comparison of the two headers

No header in the motor

Clean view of the downpipe

WR Header with gasket
Step 5

Reconnect O2 sensor in new header.
Step 6
Remove bottom gasket from the old header. You will probably need to spray some WD-40.
Once it is removed, install it on the new header.
Step 7
Re-install new header.
The tricky part is placing the header and aligning the gasket (the one connected to the manifold). The easiest way to do this is to start from the top. First, place a bolt connecting the header to the gasket (this bolt will simply be used to keep the gasket and the header aligned). Now place the other bolt. Try to screw it in place (doesn’t need to be tight). Once those 2 bolts are placed, the header will stay in place and the gasket will be aligned. You can now screw the remaining 3 bottom bolts.
Once all bolts have been placed, tighten them to 33 lbs-ft using a torque wrench. If you do not own a torque wrench, simply tighten them until you feel resistance and then add half a turn.
It is now time to bolt the 2 downpipe spring loaded bolts. Once again, tighten these bolts until the spring touches the downpipe, then add 2 full turns.
You now have a new header installed !!!

WR header installed
Note : when you first start your engine after the install, some smoke may appear. Don’t worry, it is simply the grease from your hands along with the WD-40 that is burning. It should cease within a few minutes
After you have figured out the dimensions and finalizing the design, it’s time to start building the base structure of the custom subwoofer enclosure. Begin by cutting the base of the subwoofer enclosure out of a sheet of plywood with your handsaw or jigsaw. Once you have cut the base out, place it off to the side and grab your 1/2 inch wooden dowels. Cut four wooden dowels for each subwoofer to the necessary height that your subwoofer enclosure needs to be, using your handsaw or jigsaw. Finally, cut perfect circles out of a sheet of plywood to fit under the rim of your subwoofer, so you have a solid wood base to place on-top of the wooden dowels, in order to support the subwoofer. Subwoofers usually come with a punch-out template to use in order to perfectly trace and cut the best circle to fit your subwoofer.
You now have to begin applying your fiberglass cloth, draping and stapling, or nailing, it from the wooden circle which will support your subwoofers to the edges of the base board, at the bottom of the structure. Make sure every spot is covered with a layer of cloth, then begin applying the fiberglass resin onto the cloth with your paint brush, spreading an even layer on the cloth. Repeat this, until you have several layers of cloth resin applied on the custom subwoofer enclosure, and let it dry. You now are done building the structure and you simply have to do the finishing details.
One can either choose to carpet of paint a custom subwoofer enclosure. Carpeting can be much easier and cheaper, but it may not look the best and it may not even match anything else you’ve done to the vehicle. The alternative to carpeting is to sand and paint the enclosure. Sanding and painting does take much longer than carpeting, but it will definitely look much nicer and match your vehicles overall design, if done properly.
If you end up sanding and having holes or pores appear in the fiberglass, you should use fiberglass auto body filler to make the entire exterior of the structure as smooth as possible, as any imperfection will show up after you paint, so make sure you fill in every hole, low spot, and imperfection!






























































