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Interesting findings..
I've had a DIY cold air intake with a K & N drop in filter for many years. Similar to the Comptech.
Sorry if I missed it, what air filter are you running?
Since the 1st Gen TSX engine bay is so sealed and so hot, I would still want that air horn out of the engine bay, making sure it is not drawing in any hot air.
But to extend that larger diameter air horn, even a few inches, thru the sheetmetal requires one to cut that hole larger.
To cut that hole larger and make the cut clean looking is not be easy.
For even more cooler air into the engine, you should bypass the throttle body coolant lines, if you haven't already.
Super easy to do on the TSX with zero downsides, even in the Canada winter where I live.
But the intake manifold gets super hot. I've seen folks install the insulating gaskets between the 2 halves of the intake manifold and between the base and the cylinder head.
Minimal improvement. One really has to somehow modify the intake manifold base so coolant doesn't flow thru it.
Another easy mod, if you haven't already is an underdrive crank pulley.
I've had a RSX-S OEM underdrive crank pulley on our TSX for over 10 years, zero downsides.
You can feel the difference revving thru the gears on a manual trans.
If I were to do it again, I would find an even smaller diameter crank pulley.
I've had a DIY cold air intake with a K & N drop in filter for many years. Similar to the Comptech.
Sorry if I missed it, what air filter are you running?
Since the 1st Gen TSX engine bay is so sealed and so hot, I would still want that air horn out of the engine bay, making sure it is not drawing in any hot air.
But to extend that larger diameter air horn, even a few inches, thru the sheetmetal requires one to cut that hole larger.
To cut that hole larger and make the cut clean looking is not be easy.
For even more cooler air into the engine, you should bypass the throttle body coolant lines, if you haven't already.
Super easy to do on the TSX with zero downsides, even in the Canada winter where I live.
But the intake manifold gets super hot. I've seen folks install the insulating gaskets between the 2 halves of the intake manifold and between the base and the cylinder head.
Minimal improvement. One really has to somehow modify the intake manifold base so coolant doesn't flow thru it.
Another easy mod, if you haven't already is an underdrive crank pulley.
I've had a RSX-S OEM underdrive crank pulley on our TSX for over 10 years, zero downsides.
You can feel the difference revving thru the gears on a manual trans.
If I were to do it again, I would find an even smaller diameter crank pulley.