Quote Originally Posted by isa1023 View Post
so here's your case:

ph16 (a non-vtec) port and polished head
stock IHE
4 speed matic

*for intake, cheapest best value is simota tube with knn cone-type (around 4.5k sa banawe, tabi ng autocircuit)

*very subtle to no feel on power pag intake lang on stock headers and muffs, lalo na po sa matic

*modify headers and exhaust? depends up to what extent are you willing to up them.

are you willing to remove the resonator? increase mid/downpipes diameters? go free-flow muffs and compromise added noise?

less restrictive exhaust > more hp on high rpm can be felt = more low-end torque you compromise to lose

more low-end torque you lose > mas matakaw sa gas (i suppose hindi ka naman magd-drag, so why need high-end power that often diba?)

* want silent, free-flow muffs?
ask gh. he has one, customized.

* better breathing = more power?
not right away, kahit naka port n polish ka pa.

in this case, if you bolt on the knn, you only have more air in. if you run on stock fuel maps, kahit nireset mo pa yung ecu mo after the install, you wont feel much difference.

I have the short ram in my d15b. even after the ecu reset, subtle pa rin ang feel of increased power, if any. (runs on stock headers and free-flow muffs)

* keep stock H-E and go short ram?
in my case, it's short ram > d15b m/t > stock 421 headers and midpipes (and anything in between) > free-flow muffs

result = I still have lots of useful low-end and mid-end power. matipid sa gas. medyo hirap lang si engine sa exhaust pag near redline na on high, but still it reaches and can sustain 180+ kph

* ball park figs?

KNN cone-type with simota tube = P4500
421 crush bent headers (sa fremuff) = P3800
421 mandrelbent headers (sa mufflerland) = P5900 yung aluminized (P13500 yung stainless)

muffs with optional silencer (apex-i copy sa fremuff) = P4500

Sir, advise lang, come to think of this:
Honda sohcs yield relatively high outputs using vtec wildcams on sustained high rpms.

You don't have both. Why?

- No wildcams, kasi non-vtec yang ph16 stock engine
- No sustained high rpms (expect on top gear), kasi it's matic (w/o manual override)

You feel the power gains from IHE mods most especially on mid to high rpms.

Im no honda expert, just my two-cents worth po. Hope it helps
sir, in totality, what would you suggest na pnka ok na upgrade on my matic esi? i suppose in practicality and relatively slight performance increase stand point, i think its much better to go short ram and free flow muffler lang?