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Intake, header, Exhuasts - Click HERE for Original Thread

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Anyone here done the above and noticed some increase in power?

REFLUX

yea i would like 2 know exactly how much gain u get from a catbak exhaust system
i know intake u get 3-5 maybe even more

GirlRacer P1

From what I was reading, an intake can add 0-5 horsepower.
A tubular exhaust header can have a significant impact on power: 7 to 13 horsepower.
Customizing the exhaust of your car will certainly result in a louder exhaust note, and by making the exhaust more efficient can result in a 5 to 7 horsepower increase on average. Replacing
the catalytic converter with a high flow design can also increase this number up to 10 horsepower. Hope that helps.

REFLUX

#### i always thot exhaust system would do like 25+ hp
guess i was WAAY off
it's more of a "better for your engine" thing than a "go faster" thing huh?
or i could b wrong there too!!
DAMNIT

cairo

personally i dont think there is a huge difference in doing all of the said above (I have for the record). There is a slight difference but dont exspect the car to be THAT much faster or you will be very dissapointed. My 2c.

Optiplex

cario is right...there isn't that much of a difference in HP even if you put every single one of those parts in. On average, you might see an increase of 5 - 15HP gain at the wheels. It really depends on your car. Also, the gains are usually in the higher RPM ranges like 3500 - 6000RPM. BUt if you like a louder sound or if you are looking to turbo/supercharge your car, then get the exhaust, intake, etc.

reno

Whoa - hold the phone!If you are planning on Turbo charging/Supercharging - DO NOT get an intake, exhaust, etc.. unless you plan on selling those parts afterwards.
- Turbo's will change the intake plumbing so that any CAI set up will most likely be rendered useless.
- The turbo acts almost like a muffler so you can likely take advantage of a free flowing, larger diameter Exhaust. Do not try to run a turbo exhaust on a NA unless you're death or want to be.
- Headers are a good idea for Superchargers, but they're useless for Turbo's since the turbo intersects the exhaust flow, hence requiring its own manifold.

CRXguy

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from reno on 3:58 pm on Aug. 15, 2001
Whoa - hold the phone!If you are planning on Turbo charging/Supercharging - DO NOT get an intake, exhaust, etc.. unless you plan on selling those parts afterwards. _
- Turbo's will change the intake plumbing so that any CAI set up will most likely be rendered useless.
- The turbo acts almost like a muffler so you can likely take advantage of a free flowing, larger diameter Exhaust. _Do not try to run a turbo exhaust on a NA unless you're death or want to be.
- Headers are a good idea for Superchargers, but they're useless for Turbo's since the turbo intersects the exhaust flow, hence requiring its own manifold.[/b][/quote]Well said. Think about what your future plans are gonna be. If you go force turbo, then it'll be a waste to get I/H/E.

siopao

why's that?

GirlRacer P1

Good question.... please explain.

reno

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from GirlRacer P1 on 8:12 pm on Aug. 15, 2001
Good question.... please explain.[/b][/quote]Sorry, I thought I was clear enough. Basically parts that make a NA go, are not necessarily the right parts that to make a FI'd car go, and vice versa. If you KNOW that you are going to turbocharge or Supercharge your car, do the I/H/E after the TC/SC. Identify your HP goals and go from there. If I knew I would be going turbo, I would spend my money on suspension, Engine Management, brakes first. Those items will help you regardless of which FI route you take. If you KNOW that you are not going FI, I/H/E will be a good start in getting some extra umphh. But as other's have stated, don't expect magic numbers.

REFLUX

well ####
learn somtin new everyday
good post reno, i bet a lot of people didn't take that into consideration...me being one of those ppl
<img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>

Unsure

If you go with a SC, you may be able to get away with keeping your header and maybe exhaust (if you got one big enough in the first place) The intake I'm sure can be easily modded to fit.As for a turbo, you may be able to use the existing exhaust due to the fact that your lengths will be compensated for through a custom Downpipe. (in most cases) However with that said, you will probably want something with a larger diameter to begin with. A turbo car will not use headers but rather a combo of an exhaust manifold and DP so the header is a waste.The intake.. I'm a big fan of fabing up your own. You can make a CAI (AEM style) for like 90 bux or so (including filter). Then if you go with a turbo, you can re use some parts for charge piping and just strap the filter on the turbo (provided there is room.. otherwise you will need an intake pipe from filter to turbo)Going back to the original question, With IEH, the most notalble gains came from Headers and my home made CAI.

CYA

yup yup yup... intake header and or exhaust on the typical 4 cylinder is a total waste of money.correct me if i'm wrong on the prices but:intake - &#36250
header - &#36750
exhaust - &#36750now you've spent like almost &#362000 and for what? 2-3 tenths in the 1/4? a whopping 10 maybe 15 hp?imports simply don't respond to these mods. why? because you're limited when it comes to n/a power production. you only have 4 cylinders drawing air into the combustion chamber. yes... you can spin it to 7500 or so rpm so the pistons will move faster and draw more air in but it's still not enough to overcome the limited displacement. if you want to build yourself a bottom end that will spin to near 10,000 rpm and aquire an induction system with the right port lengths and camshaft(s) that will go with the added rpm then yes you will benefit with intake, header, and exhaust. but fact is... pretty much nobody here in e-town has done this. now if you're not ready to tear into the motor... save your money and buy yourself that forced induction kit because your intake, header, and exhaust system isn't going to help draw enough air into the combustion chamber to develop a significant gain in HP so that's why you need forced induction.cya

icon

Well I dont have money to buy all three (definately not a turbo!) So which is the best bet? I read on another post that I can get the same intake that Cairo has for &#36200. Dresses up the engine quite nice. Anyone know what it sounds like?

RaGingAngeL

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from icon on 5:51 pm on Aug. 22, 2001
Well I dont have money to buy all three (definately not a turbo!) So which is the best bet? _I read on another post that I can get the same intake that Cairo has for &#36200. _Dresses up the engine quite nice. _Anyone know what it sounds like?[/b][/quote]It's gives a very neat induction note on a 4cylinder...deep bassy kinda noise usually not associated with overgrown lawnmowers. _It is especially pronounced if you don't have a loud exhaust.If you have a twin cam VTEC when switch over kicks..... you'll definately notice the change in tone now....(Edited by RaGingAngeL at 1:25 am on Aug. 23, 2001)

Genki

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from CYA on 3:13 pm on Aug. 22, 2001
yup yup yup... intake header and or exhaust on the typical 4 cylinder is a total waste of money.[/b][/quote]What about for my car? Im sure it wont do much either...99 GP GT <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'> 3.8L N/A v6

REFLUX

just add an extra P to the GT part & & instantaneous 60+ HP will b feltGT=>GTP

I would have to agree with CYA that typical 4 cylinders have minimal gains with a full exhaust setup. Rotaries on the other hand are a different story.I don't know if anyone out there even drives an RX-7 or rotary powered vehicle but RX-7's respond very differently to a full exhaust mod for a couple of reasons.The rotary engine is very loud, to reduce the noise, Mazda installed a header that was very very restrictive.The rotary is very bad with emmissions so a multiple catalitic converter setup was required to meet North America emmissions standards, again very restrictive. 3 cats in an N/A, 2 in a Turbo ll.Now if you do the very basic road race header dual outlet(One exhaust port per rotor), True dual exhaust(Dual straight pipes from header to mufflers) setup, N/A's can have hp gains of up to 28%. For an 86-88 at 146hp stock, that's 40 extra hp totaling to 186hp at the wheels from just a full exhaust upgrade (A bonus to this setup are some nice fireballs shooting out of your dual exhaust during shifting at high RPMs)The true dual exhaust for RX-7's can be had for as low at 800 installed, cheaper than those pre fabricated catback systems that are on the market today which go for at least 800 does not even include the header or installation.So for any rotorheads or future rotarites out there, it's written in stone that the first mod you should do for your rex is a full free flowing exhaust system.

TurboBlueNX

Usually when you replace the air intake with an aftermarket one, you are completely bypassing the stock resonators built into the OEM intake box designed to "get rid of unwanted noise" (These would be the little emplty plastic boxes attached to the intake tract)As for the I/H/E combo for NA cars if you know you're staying with NA, go for it, if you want increased maintenance, save your money for the turbo <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>If you go turbo, you definitly want the bigger exhaust, a new turbo manifold and a custom intake for the turbo.

Genki

quote:
Originally posted by -><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from REFLUX on 10:25 am on Aug. 23, 2001
just add an extra P to the GT part & & instantaneous 60
<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from REFLUX on 10:25 am on Aug. 23, 2001
just add an extra P to the GT part & & instantaneous 60+ HP will b feltGT=>GTP

AHAHAH.. if it were only that easy <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=':p'>

REFLUX

oh but it is!!!
haha <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>

MugenBoy

Ok, so say u go mass head work digging into engine. I'm talking about performance cams, cranks, rods, pistons, etc ...After all that would it be necessary to get I/H/E to reinforce it (ie allow better breathing, etc?)

Genki

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from REFLUX on 8:52 am on Aug. 24, 2001
oh but it is!!!
haha <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>
[/b][/quote]Reflux:ahha K ill try it <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>. Acutally cheapest way for me do get as fast as the gtp would be to trade in my GT for a used GTP, which i am considering if &#36&#36&#36 goes my way <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>. Or i can spend tons of money on everything available out there for my car <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>. but the again it prob be cheaper to buy the GTP engine/tranny and put a smaller pulley on it to achieve those speeds/times <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>.

seven

<table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from Genki on 4:37 pm on Aug. 26, 2001
Reflux:ahha K ill try it <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>. _Acutally cheapest way for me do get as fast as the gtp would be to trade in my GT for a used GTP, which i am considering if &#36&#36&#36 goes my way <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>. _Or i can spend tons of money on everything available out there for my car <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>. _but the again it prob be cheaper to buy the GTP engine/tranny and put a smaller pulley on it to achieve those speeds/times <img src="http://www.asianet.ca/images/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>. _
[/b][/quote]lets build a turbo for your GP Kev! we'll put all that thermo and fluid dynamics to work! =P

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