3M marine adhesive is good enough to keep water outside of a boat in through-hull situations. It’s also extremely strong and fast-setting. It’s more than good enough for use to create an environmental seal between a panel and the firewall. The SC300 is filthy, so we made sure to clean the firewall well before attaching the panel. Make sure you do the same.
Well, you should probably have pulled the engine and all of the interior and all of the sound deadening and power washed the hell out of things before you started with ANY of this stuff, but that would only make sense in hindsight, right?
You can see the factory Lexus ABS unit in the foreground. It is going to be removed since it is no longer being controlled. An unused ABS unit is a great place for lots of air to get trapped in a brake system, so it really should go.
Some day in the future it will be replaced with an aftermarket, motorsport-focused unit. There are not many options, but factory ABS tends to misbehave once racing brakes and super sticky racing tires are involved. At the super high end is the Bosch M4, which may be the gold standard, but also can end up costing $10,000. A common mid-priced option is the Teves MK60 ABS unit, which came on the E46 M3. It is possible to use these in a stand-alone fashion, and higher-end configurations have some programmability. There are several vendors that deal in these systems, and we hope to review one in the future!
Finally- many, many hours of labor and essentially all of the openings are sealed and all the devices are secured. Now what? You’ll have to come back and see.