Anyone know?

 

96-00 EX exhaust manifold should work. Can someone correct me if I'm wrong?

 

header?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NOSpeed97 &raquo;</TD></TR><TR><TD CLASS="quote">96-00 EX exhaust manifold should work. Can someone correct me if I'm wrong?</TD></TR></TABLE>

sounds fine to me. exhaust manifold tho, not header.

 

you can put the dx/ex one on but you will have to cut your exhaust main pipe and have it rewelded to fit right.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by monicle &raquo;</TD></TR><TR><TD CLASS="quote">you can put the dx/ex one on but you will have to cut your exhaust main pipe and have it rewelded to fit right.</TD></TR></TABLE>

No, unlike the 1992-1995, the 1996-2000 Dx also has it's catayltic convertor inside of the exhaust manifold.

To answer the original question, you must buy a header for a 1996-2000 EX only and then buy a catalytic convertor for an Ex as well.

Usually aftermarket cats and OBD2 don't mix, so good luck.

If you're trying to mod an HX, let me suggest the number one thing to make it quicker:

EX TRANNY.

The HX tranny licks ***** for acceleration with it's tallest gears and lowest final drive ratio. An EX tranny would make it a lot quicker than before - probably quicker than any other i/h/e EX you run into because the HX is lighter than the Dx hatchback and the HX motor puts down almost the same whp as the D16Y8 EX engine.

The HX tranny kills you guys.

 

Damn, my long reply got lost.

Thanks all.

Talking about '96-00 Civics here:

1) Do the DX and EX have the same motor? Same head?

2) Does the HX have the same head as the EX, but just with different cams and ECU?

B18, I need the tall gears for the fuel economy for my wife's ~750 / wk of driving. Shorter gears will help mostly 0-40 mph because 1st redlines at 40 mph. I feel the car can use a bit more oomph at higher speeds, which shorter gears won't help, assuming the driver downshifts to get RPMs in the powerband (5-7k)

So. I want a wee bit more power on the cheap. If Honda made some variant of Civic with a shorty factory header with no cat, that would fit the bill. I'm hoping to relocate the cat by perhaps using a B-pipe from a different Civic that will bolt up to the above factory shorty header (if it exists).

Thus my question.

TIA

 

1. NO... the Ex has a d16y8 the DX has a d15 i believe
2. Hx actually has a better cam and has roller rockers, actual head may be similar, but i believe most of the intrernals are different.


You will still get really great gas milage with the ex tranny. That is what i had, and i still got mid 30's/gallon with highway milage....so i wouldnt worry about that, and from driving an hx and ex... ex has a much nicer tranny.

and am i missing something about cat placement on an hx? cuz if it is like the ex you can just put a test pipe in if u want to get rid of it.

 

the ex tranny on the hx engine will still get great MPG's plus you get your better gearing. As tom said, get the entire EX exhaust manifold, the ex has the cat separate and under the car. But you will need to extend your o2 wires to reach.

The DX & HX both have the same manifold with the cat being incorporated into the manifold. For the money you're better off just picking up a DC header for the ex & a used ex cat and bolting those up to a ex b pipe. Straight forward.

I just dropped in a ex y8 into my hx. So i have looked at what i can use and have learned a lot from spade. Need more tips? check my sig.

Edit: The ex and hx heads are very similar, but internal parts are NOT interchangeable. The hx does have roller rockers but uses a 2 lobe camshaft and the ex has standard rockers but three lobe cams. In theory you could use a really radical cam profile in the hx head since the roller rockers would not wear as quickly.

You can also try using a complete Y8 longblock and tranny, with the hx intake and exhaust manifold along with the hx ecu. I ran my car like that for a little while and although the vtec kicked in really early 2200-2500 rpms, on the freeway acceleration was killer, it really pulled hard. never got to dyno it tho to see if it was perceived gain or real.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason C SBB &raquo;</TD></TR><TR><TD CLASS="quote">Damn, my long reply got lost.

Thanks all.

Talking about '96-00 Civics here:

1) Do the DX and EX have the same motor? Same head?</TD></TR></TABLE>

No. The Dx uses a D16Y7 non-VTEC engine with a very different head, but similiar blocks.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">2) Does the HX have the same head as the EX, but just with different cams and ECU?</TD></TR></TABLE>

No. The HX utilizes a roller type valvetrain and a more efficient head than the EX does. I remember seeing a comparison dyno sheet where the HX motor actuaklly outpowered the Ex motor with similiar mods.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">B18, I need the tall gears for the fuel economy for my wife's ~750 / wk of driving.[quote]

Trust me, even an Ex tranny will get killer highway mileage. You actually might get worse overall highway mileage because in 5th gear in an HX tranny you actually might be bogging the engine more than with an EX tranny.

I recall reading (years ago) where an engineer put an engine (Honda 1.5L DX engine if I recall) on a dyno and ran a tank of gas through it at a certain rpm. then he did the same thing, but at a higher rpm. The engine got more time with the same amount of gas at the higher rpm.

 

Thanks again for all the replies.

Browsing the excellent Majestic Honda website, it appears the '96 non-CA EX has a shorty header which extends to the A-pipe, and its cat is under the car.

I may still consider it, even if moving the second O2 sensor to after the under-car cat will produce a CEL - some black electrical tape will take care of that. :D I will have to live with changing the exhaust back to stock every 2 years. My conscience will be clean; the fact that my wife drives a car that gets 35 mpg isntead of some giant SUV means I'm doing my part for the environment (lower CO2 emissions). Moving the cat further from the engine only means more cold-start emissions, and well, it's not exactly cold in CA, and the car does hiway miles (fewer cold starts).

On the EX tranny, let's agree to disagree. There is no difference in acceleration between a car at say 80mph if it's geared such that it's at 5000 rpm in 3rd gear, or if it has to be in 4th gear to get 5000 rpm. The only advantage of shorter gears is that for a given range of road speed the gears are usually more closely spaced and thus keeps the revs more in the powerband, which I agree can be significant.

However, having a tall cruising (5th) gear helps fuel economy because running an engine at a lower RPM operates it at a lower BSFC (brake specific fuel consumption). This comes from reduced frictional and pumping losses, the latter from running at a larger throttle opening. Did you ever try cruising at a fixed speed and comparing 4th and 5th gear? EGT, water, and oil temperatures go up in 4th gear, and the Electromotive TEC3 ECU monitor screen shows a higher fuel flow rate (in my other, turbo'ed, car)

I'm sure Honda knew what they were doing in giving the HX such tall gears. This effect is also what improves some GM products' MPG, such as Corvettes - the "skip-shift' feature which keeps RPMs low in ordinary driving.

Cheers,
Jason

 

OK now, does this sound like a plan for my HX:

EX factory shorty header
EX A-pipe
Si cat
Si B-pipe
Si final muffler
relocate rear O2 sensor to behind Si cat