Mga sir / experts sa honda,

I am planning to put stage 1 mods on my 95 esi A/T. is it safe to upgrade IHE pag matic? this is the max mod i want to do on my esi with regards to engine performance. egnine is well maintaned, no leaks or whatsoever. Castrol maintained engine oils, newly flushed AT fluid (used honda ATF Z-1). I also have a port and polished cylinder head.

now here's what i want to know:
-what are your recommendations on intake (i dont want cold air intake, just want a short ram intake that has increased diameter)
-if intake lang papalitan ko, ramdam ko na ba agad lakas?
-or do i need to modify headers and exhaust as well para ma max ko yung upgrade?
-any suggestions on headers and exhaust? i dont want a noisy muffler, i want it silent and yet free flowing
-based form my research sabe nila better breathing = more power, so does this mean increased diameter ng intakes as well as headers and exhaust? ganun ba yng sistema talga?
-what will happen if i keep the stock headers and exhaust but upgrade the intake?
-lastly, can you give me a ball park figure kung magkano intake, headers and exhaust na pnaka ok sa honda esi 95 ko. yun lang mga sir... maraming salamat!