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Can Coroplast rest directly against the bottom of the engine and transmission ?
It would press upwards on the oil pan, as well as the transmission.
I know you need 2 - 3 " clearance around the exhaust pipe.
I plan to add a center section of sheet metal (steel roof
flashing ) that will touch the exhaust pipe.
Is this metal coated with anything that could catch fire ?

Do you need extra clearance near the cat. converter ?

My exhaust pipe hangs quite low.
It will be enclosed by a steel dryer pipe.
Since the entre underside will be sealed, it's going to trap pockets of heat.

I plan to perforate the metal and add reverse ducts to expel the heat, but I'm still concerned about it being trapped and what it would do to the Coroplast.

How would heat from the exhaust pipe transfer across a steel shield that extends around 2" ?
I ask, because the gas tank is directly behind it.
I would imagine that heat could transfer though the metal and cause an explosion if touching the gas tank.
Rather than have the steel shield cover the pipe and rest on the top of the gas tank, I plan to have it hover over it ( have a small gap in other words.
There would be a Coroplast cover over the gas tank that will be shaped to re-attach the airflow.

How does aluminum react to heat, vesus steel ?
The Coroplast will be screwed to aluminum transition strips that will loop on top of the exhaust pipe.
( The exhaust pipe will have the transition strip resting directly on it )


I'm enclosing my entire underbody on my 1993 Civic hatch.
Just like Basjoos - in fact this will be a sort of AeroCivic Lite, or AeroCivic Jr.
I plan to copy what he did, but with a few modifications.

I wish he was still active on the forum.

Any advice is appreciated folks !