V8 4Runner Header Installation - 4th Gen 4Runner Doug Thorley Headers - THE BEAST!!!

In this video we install Doug Thorley 4-2-1 headers on our 2004 V8 4th gen 4runner. Towards the end of the movie, we do a sound comparison and dyno it. We make at least 37.4 ft-lbs more torque!!! We plan to tow our track miata with this 4runner - so every bit more torque helps. This vehicle has been completely transformed!

We did all of the common bolt-ons at the same time:
Doug Thorley headers installation
Y-Pipe Installation
O2 simulator installation
Gibson catback exhaust installation
Volant air intake

Parts:

Doug Thorley Headers (off road use only): https://www.urdusa.com/thy-564y-ls-c-...

Y-Pipe: https://www.urdusa.com/89253-doug-tho...

O2 simulator (off road use only): https://www.urdusa.com/urd-rear-senso...

Gibson cat-back exhaust:
https://www.summitracing.com/parts/GI...

New Fastenal engine mount hardware (class 10.9):
https://www.fastenal.com/products/det...
https://www.fastenal.com/products/det...

NGK spark plugs:
https://amzn.to/2Sq4zFr

Rubber splash guards/rain guards:
https://amzn.to/2SmVgWQ

Milwaukee Cordless Ratchet:
https://amzn.to/2HSHh9a

Milwaukee 1/2" Impact:
https://amzn.to/3lgzIYu

BudBuilt Skid Plate (AL, bare metal):
https://budbuilt.com/Front-Skid-Plate...

Headlights (custom FX-R Bixenon projector retrofit on OEM Toyota headlights):
https://lightwerkz.net/

Music by Kurtis Tyler (check out his Spotify!): https://open.spotify.com/artist/5nVCW...