Matagal-tagal na yung thread na ito, but thanks, Migs, for this very helpful thread.
It pretty much covers the basics.
One thing I did miss out on is aftermarket Air Intake Kits (K&N, Simota, HKS, and the like). What can people realistically expect from these?
1. Practicality, in terms of reusability. Check.
2. Marginal power gains. Check.
3. "Enhanced" engine sound. Check.
A. BUT, how do these affect fuel consumption, ASSUMING no change in driving style.
B. AND, how do these affect engine performance, in terms of smoothness and stability?
C. ALSO, how do these affect engine durability and reliability in the long run?
D. LASTLY, are there any real differences, aside from branding, between these kits?
I hope this info will be helpful to others as well.