I’ve been using the original Perrin Performance Equal Length Headers for over a year and I couldn’t be happier with them. Of course, when I heard that Perrin released an updated version of their headers, I had to check them out for myself. Since I’ve gone through quite a few upgrades over the last year, I decided to go with the Big Tube version.
As always, the product was perfectly packaged and arrived safely through the mail. This is a big deal to me because I’ve had so many items destroyed during the shipping process. Perrin always goes the extra mile to make sure their products are packaged well and protected.
A friend of mine recommended that I have the headers ceramic coated. While it sounded like a great option, I decided to use a titanium heat wrap again because I didn’t want to wait any longer to install the headers. I’m fairly certain that doing either will void the warranty on the headers. So make sure you are OK with that if you decide to go either route.
Here’s a photo of the finished wrap:
The installation was pretty easy. I’ll walk you through my install process, which is slightly different because I already had aftermarket headers.
- Raise vehicle on a lift or onto jack stands
- Remove the splash guard
- Remove the 02 Sensor from the current headers
- Remove the 14mm nuts (6 of them)
- Remove the 14mm bolts (2 of them)
- Remove the headers and discard the used gaskets
- Place new headers onto the motor (insert new gaskets while doing this)
- Hand tighten 14mm nuts and bolts to hold the headers in place
Note from Perrin: “The header flange that mates to the uppipe should fit very flat to the uppipe. Due to different turbos, aftermarket uppipes and installation methods, this may not line up perfectly. It’s critical for both the life of the uppipe and the header that these flanges sit flat and line up perfectly. IIf they do not line up perfectly, remove the downpipe and loosen the nuts on brackets connected to uppipe, then proceed with installation.”
- Tighten the bolts that connect the uppipe to the headers (50-55 ft-lbs)
- Tighten the nuts that hold the header to the head (50-55 ft-lbs)
- Re-install the 02 Sensor (20 ft-lbs)
(I recommend using anti-seize on the head studs, 14mm bolts and 02 Sensor)
- If you had to loosen or remove the downpipe during the install, go back and re-install
- Once everything is tightened down, start the vehicle and check for exhaust leaks
- If no leaks are present, re-install the splash guard and take it out for a test drive!
Note from Mitus (if you have an Oil Cooler): While test fitting the E4 series headers I found that they were making direct contact with my oil cooler lines. Make sure you check for this if you have an oil cooler! See the photo below which shows the contact with the oil cooler lines:
I had to have new lines made and routed them in a more efficient manner which allowed for more clearance. We used 90 degree fittings to direct the oil cooler lines away from the headers and provide adequate clearance.
I had the opportunity to get my car on a mustang dyno for a before/after comparison between the two headers. We weren’t tuning yet, but it at least gave an idea of the difference in power. There was an increase of 12 whp and 4 torque. I’ll be taking the car in soon for a new tune and will post again to share the final results. Thanks for reading!
Here’s a link to the headers on the Perrin Performance website if you want to check them out.
Use the discount code “BeastSTI” at checkout for a 10% discount on most Perrin products!