Bkit kaya guyz? Ganito kc ang ginawa... Pinutol ung tubo sa ilalim den doon nilagay ang muffler... Inalis din pla ung resonator... Humina ang hatak ng sasakyan ko.. Bkit kaya? Btw my car is Civic ESI..

ano details ng downpipe? was it bigger in diameter than stock? anong config - 4 pipes converging to 1 and onwards or 4 pipes converging to 2 then converging to 1?

first of mali yata yung term na downpipe.Anyway you lost back pressure kaya humina hatak auto mo.

kinda confused here....are you saying that your car didnt have a muffler to begin with?(running straight pipe?) and they cut the pipe and added a muffler? or...they added a second muffler on the exhaust system? or...they changed the muffler? or did they relocate the muffler?

if you were running straight pipe(no muffler) and they added the muffler..then yes.its called back pressure.you will definetly loose some torque.

if they added a second muffler(which i doubt)...then your axhaust is working harder breathing.

if they changed the muffler.....that means your using a non-high flow muffler

if it was relocation...it could be all 3 and/or more pipes to go around before exiting the exhaust.

I think what he means is that they cut the pipe in the middle (deleting the stock muffler and resonator) and they put a resonator muffler there mid-chassis.
This is the "scav" or "scavenger" exhaust favored by rice-boys and street-racers... and yes, it'll have a horrible effect on low-end torque and mid-range power.
Basically, the shorter your pipe, the higher the theoretical top horsepower is and the lower the torque.
Eventually, you get to the point where your peak horsepower comes at rpms that your engine can't actually reach, and all you get is lost torque, lag and poor performance unless you drive at 7000 rpm all the time.
Pare, just get a straight pipe and stick a muffler at the end. Put the resonator back, too. a lousy additional 5 hp from the "scav" at 7000 rpm isn't worth losing all your torque everywhere else.

Pareng niky medyo tama ka.... This is what they did... The primary muffler is still intact... The secondary muffler or the resonator "ung sa bandang ilalim ng transmission" was removed and was replaced by sa Fireball copy freeflow muffler.... SOBRANG INGAY... Kalampagan sa ilalaim... Humina ung hatak ng sasakyan ko... Dti kc mga 7 to 10 secs nkaka 100 kph na aq, but now kyang abutin kaso parang hirap ung mkina.... Wat do i need to do in order to boost my torque and add a little hp pero buo pa din ung 2nog ng muffler "ung tama lng"...
Guyz ung primary muffer ba ay pdeng palitan ng powerflow? May inooffer kc sila sa akin... Pampabuo daw ng 2nog... 22o ba i2?

downpipe? dba pang turbong makina lang yun... anyway tama mga sir natin..baka nawalan nga ng back pressure..cguro mas maganda sir ibalik mo nalang yung dating setup pero palitan mo nalang yung resonator ng hi flow.. tapos muffler...

San b banda ung resonator? ung primary b or ung secondary? sori kc noob me sa exhaust eh....

I guess the first question is, what is it that you want to achieve? Power at high RPMs or low to mid range torque?
You'll have to dyno your car to be sure you get what you want. Niky's right, there's a point where if it's too short, it becomes useless.
And what application? Kasi kung sa kalye lang din naman ibalik mo na lang yung stock, di pa masakit sa tenga.

The Fireball is too big, most likely.
I'm guessing your car is a 1.6, right? First: Put a flexi-tube between your headers and the midpipe, this will help with the "kalampag"... if needed, put another one before the muffler. Flexi-tubes may cause a little back-pressure, but they're good for peace-of-mind.
Limit your mid-pipe to 2"... better yet, for regular 1.6s (not those MIVECs or B16As), do just 1 7/8" for a little more torque.
Get a good resonator with the same interior diameter as your midpipe. Check the interior for metal protruding into the airflow... this is bad for power and torque, and causes back-pressure. If you can, have them file away those little bits, as it'll improve flow.
Get a good muffler. If you've got a stock muffler, it might be coming apart inside from the pressure you're putting through it... :grin: ...with a good long resonator and a reasonably nice "glasspack" muffler, you should get decent top-end, decent torque and a smooth sound. Don't settle for the cheaper mufflers, better to test-sound them before installation.
This'll cost you money, but I hope it helps.
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I don't really see the point of "scav" exhausts... man, when the pipe fell out of one of my older cars (stupid frigging Nodalos...), it lost a whole lot of torque and power. Sure, there's some kick high up in the rpm range, but it's near completely unusable.

Pareng niky medyo tama ka.... This is what they did... The primary muffler is still intact... The secondary muffler or the resonator "ung sa bandang ilalim ng transmission" was removed and was replaced by sa Fireball copy freeflow muffler.... SOBRANG INGAY... Kalampagan sa ilalaim... Humina ung hatak ng sasakyan ko... Dti kc mga 7 to 10 secs nkaka 100 kph na aq, but now kyang abutin kaso parang hirap ung mkina.... Wat do i need to do in order to boost my torque and add a little hp pero buo pa din ung 2nog ng muffler "ung tama lng"...
Guyz ung primary muffer ba ay pdeng palitan ng powerflow? May inooffer kc sila sa akin... Pampabuo daw ng 2nog... 22o ba i2? yung sinsabi mong primary muffler ay yan yung tinatawag na catalytic converter kung di ako nagkakamali,at sa kaso ng exhaust system mo,kung pinalitan mo ng the same diameter ang pipe nito,yes magkakaroon sya ng epekto sa takbo ng car mo dahil inincrease mo yung backpressure nya(high backpressure low power,low backpressure more power,,,kung gusto mong iupgrade ang exhaust components(pipes),increase the diameter of the pipes from its original one by 10-15% from resonator down to muffler(free flowing muffler)and you will be gaining 2 to 3 more hp and 3 engine torque.

Guyz.. Thnx sa mga reply nyo... This is wat I did knina... I bought a "powerflow resonator" and I ask the shop to upgrade my pipes from the resonator going to my muffler... Your are correct guyz.. I gained a lil hp and torque and it also reduced the noise....
Follow up question lng guyz... Can I remove the primary muffler or the so called "catalytic converter"? Can I change that into a powerflow resonator also? Will I gain torque and hp if I am going to remove that and have it change??? TIA....

Wala yatang catalytic converter yung local ESi... but I might be wrong, as the US version has one. Check what it looks like inside. Cats have a mesh covering the inlet, while resonators are straight through.
If your engine is in good condition, it should be okay. My car is running catless and it's far, far below allowable hydrocarbon emissions for 2003 and up vehicles (according to LTO standards) and still within Euro standards (although I can't find exact conversions).
Honda's small engines were originally conceived to pass previous emissions requirements without cats, so as long as it's in good tune, with no sensor, spark plug or compression problems, it should be okay.
Of course, the easiest solution is to buy a high-flow cat. BUt that's expensive.

SO kung aalisin ko ung primary muffler or ung so called "cat converter" and change it into a powerflow resonator mas bibilis kaya ang hatak at takbo ko??
Dagdag torque at HP ba i2?..

IMO
Upgrading your exhaust system is the least cost-effective way of adding hp & torque output to a small-displacement engine.
Simply put, there are a lot things that can go wrong when upgrading an exhaust system unless it is a bolt-on upgrade. A sloppy welding job will even impede the flow of your exhaust. :nono:
A port-and-polish from a reputable shop (plus a free flow air intake) is the best stepping stone for future upgrades.

IMO
Upgrading your exhaust system is the least cost-effective way of adding hp & torque output to a small-displacement engine.
Simply put, there are a lot things that can go wrong when upgrading an exhaust system unless it is a bolt-on upgrade. A sloppy welding job will even impede the flow of your exhaust. :nono:
A port-and-polish from a reputable shop (plus a free flow air intake) is the best stepping stone for future upgrades. That much is true. One sloppy weld will produce about as much backpressure as a catalytic converter. Medyo mahal magpagawa ng mandrel bent exhaust o bumili ng original headers, but these will produce the most power.
I got most of my gains from the headers, a custom bent pipe didn't give me any additional power, so I'm going to a mandrel place this week and leaving the car there. :grin:
Actually, the most cost-effective is really a set of original headers. Intake alone gives very little power, as does a muffler alone. An original set of headers can give you 5-8 hp alone, without any further mods.
Headworks, medyo nakakatakot unless the machine shop knows what it's doing, but if you research it well enough, and do it at a shop with a flowbench (ATI in Cavite supposedly has one), the gains will be good. If the shop isn't experienced, delikado yun...

nde b i2 magastos sa gas?

Pero ang dami ko pa din nakikita na naka downpipe at naka scub sa kalsada.Madalas na nakikita kong nakadownpipe Honda SIR.
Pwede ka magdownpipe kung nakaset up na ang makina mo yun nga lang mawawalan ka ng torque.
Nung nanood ako ng drag racing sa Manila Harbour Center.Meron naka downpipe na SIR.Idling niya tahimik pero pag nasa mid range to high rpm ang ingay na. paano ba yun?
OT: elterrible sali ka sa club ko.Saan ba location mo?

Magastos? Kung well-tuned yung system mo, meaning to say, maganda ang top end na di sobrang bawas ang torque, okay ang gas consumption niya (basta di ka humahataw).
Kung sobrang open ang exhaust... kawawa ka sa gas bills... :grin: