Looking at your intake temp reduction goal - I think you have an excellent opportunity here. That cone filter behind the exhaust headers is a bit of a disaster setup.
It’s worth getting some blister packs or use a laser pyrometer to do a current measurement of your intake temp to have a comparison before and after.
Quoting from Horsepower Academy discussion
“The air density will be about 0.003% greater for each 1degC reduction. I think the power change would be about .15% per degC, so a drop of 10 degC, could yield a 1.5% horsepower increase.”
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