I remove the OE downpipes and show how to install piggie pipes, plus a step by step tutorial on the flap mod for the 4.2L V8 intake manifold found on the 2003-2008 Audi S4.
Featured Shop Tools and Project Materials (Amazon)
DEI Under Hood Acoustic Lining: https://geni.us/DEI-underhood-lining
DEI 12″x12″ Gold Reflective Barrier: https://geni.us/DEI-reflect-a-gold
Vibrant O2 Sensor Spacer Kit: https://geni.us/vibrant-O2-spacer
Intake Manifold Cleaning Brushes: https://geni.us/bottle-brush-set
Mini Wire Brushes: https://geni.us/mini-wire-brush-set
Centering Punch: https://geni.us/centering-punch
Deburring Tool: https://geni.us/deburring-tool
Skip to chapters
00:00 – Intro
01:07 – Under hood insulation fix
03:46 – Piggy pipe downpipes install
11:27 – How oxygen sensors work
14:34 – Oxygen sensor spacer demo
16:32 – How the intake manifold flap works
26:08 – Flapper mod DIY steps
35:17 – Flapper arm repair mod
35:47 – Goooold!
36:29 – JHM intake elbow coolant bypass
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why not just remove the intake manifold flap all together? similar to the cats, less restriction and more air flow
As an S5-V8 owner with p2004 error (flaps stuck in open pos) inside the intake I am trying to learn as much as I can because I'll be damned if I want to pay £3500 to have a new one fitted. Mine is the magnesium intake with electrically operated flaps and is slightly different but I found your video to be most informative. Kind of like a friendly study class. One of those I-think-I've-bitten-off-more-than-I-can-chew classes! – but hey, nothing ventured and all that.
Subb'd and Liked. Thanks again.
Amazing video
where is the video of the sound of the exhaust ?
Here from Matt's post on Facebook. Was not disappointed.
Any downsides of gutting all 4 cats?
where did you get that type of material for flapper mod?
I got longtubes while I had everything out, definitely one my favorite mods. Completely different sound.
Edit: Also I've driven my S4 through 3 Toronto winters and have had no issues with cold throttlebody sticking
Shut the fuck up and do the work
How tough should it be to move the pivot arm. I have my b6 s4 manifold on the work table and I can move the pivot arm back and forth but it does take a bit of strength to move it. Thanks
The down pipe 3 bolt flange that’s on driver and passenger bank all six Is actually a 12mm nut. great video dude keep up your vids !
What size nylon bolts /washers did u use
wow i just found you and i gotta say your videos are great, really educational and im really thinking about doing some of these upgrades on my B6 S4 avant. Thanks man looking forward to new episodes with this build
Keep up the videos. Love it
Enjoying the series. I'm a B7 S4 Cabriolet owner from Lethbridge. I feel like I've replaced/modified 50% of the car over the past two years. Fun, addictive and expensive! Thanks.
Yesterday I took a stapler to my hood insulation to stop it from leaking foam! I needed this!