(These parts may work for other model cars)
As most may know, at this time there are 3 engine bay covers available:
(Fig. 1 )
Long battery cover (replaces the current cabin filter air cover):
Part# 8E1-819-447-01C (my local dealer retail $38.92)
(Fig. 2)
Small slide cover over the battery only (inserts into part above):
Part# 8E1-819-422-A-01C (my local dealer retail $16.95)
(Fig. 3)
Driver side RS4 side panel cover:
Part# 8E0-103-927-F (my local dealer retail $43.22)

The long battery cover fits perfect into the provided area, (as you face the engine with the hood open driver side is on your right) the bottom edge tucks nicely under the molding (Fig. 4), you do not need to pull off the molding, just use a credit card to lift one edge, then slide it across and the molding will flop right over the plastic edge of the cover.

The fitment issue is with the RS4 cover (Fig. 3). (As you face the engine with the hood open driver side is on your right.) If you lay it in there and push it down either the upper left corner goes up above the molding (Fig. 3B) or if you push that end down, the bottom left hook comes up (Fig. 3C).


When it's down and the hood is closed there is no worries of this cover moving of going anywhere b/c the hood lifter pump arm lays into this cover and keeps it in place but it's nice to get it to at least lay there even.
I experimented with a few things and wanted to avoid lengthy mod's and did not want to bolt or zip tie it down, figuring if a dealer needs to remove it, I would not want them breaking it during the process and tried to make it pop in/out easy.
I ended up making (2) simple modifications to allow for a better fit.
With the RS4 cover on a work table.
1. Take the bottom left hook (Fig. 3C) and at it's point of connection to the rest of the cover (Fig. 3D) heat it up with a hair dryer or something with more heat, I used a hair dryer for 15 minutes (apply heat from the back) until it got nice and hot. As you heat, pull the hook part down as if you are trying to take the curve out of it and make it straight.


After the heat, feel free to put a flat heavy object on the hook to keep the new shape. (I jammed it under a dehumidifier in the garage (Fig. 3E).)

2. Find a piece of black rigid plastic (Fig. 5), (you can use the flapper cover from an old VCR tape) cut it to about 1-1/4"Long x 1/2"Wide x 1/16"Thick (Fig. 6). Using a glue or epoxy, glue this piece under the cover in the upper left corner (Fig. 7). Let it dry and you're set!
Fig. 5

Fig. 6


Fig. 7



First I tried crazy glue and it started to come apart after a few days, so Plastic Epoxy worked best (Fig. 8).
Fig. 8

The new tab you glued will slide under the molding and prevent the top left corner from popping up and the bottom left corner will remain tucked in the bottom left corner!
Finished product:





Enjoy!
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