[civiceper]

Which one is better header for 96 coupe DX ? DC ? HP ? I heard HP can give up to 8 HP ? Also, if i want to put a high flow catalytic is it better goes with carsound ? and which is better for piping for Apex N1 muffler, 2.25 or 2.50 ? do i need resonator ?
Thank's

 

[90legend]

2.5 sounds good
and if u build the engine an go F.I the 2.5 would be a better candidate.

 

[GroundControl]

If you have basic boltons then definetely go with the 2.25 inch piping - and have a resonator put on(about 35 bucks)... if you don't it will be loud as shit - and you will get a headache after being in your car for longer than 15-20 minutes(especially with the N1 muffler). 2.5 inch WILL MAKE YOU SLOWER - because your engine will lose too much back pressure. If you put on a LARGE nitrous shot or like "90Legend" said - Forced Induction... then I would worry about going larger. But if you put put 2.5 on with i/h/e - your car will be a dog off the line. I haven't heard any complaints about carsound cat's... and I understand that they are very cheap. Just make sure it has a place to put your 2nd O2 sensor into it - or you will get a check engine light.

 

[civiceper]

2.25 is better ?

groundcontrol, so 2.25 piping is better for i/h/e ? thank's

 

[95CIVIC]

2.25"

i have 2.25 and you will feel the diff...

 

[HybridJDMHonda]

Diameter guide:
1,500cc-2,000cc: 2-inch
2,100cc-2,500cc: 2.25-inch
2,600cc-3,000cc: 2.5-inch

[Add .5-inch when using N20 or FI.]

Backpressure and exhuast stream....
What engines need is LOW backpressure, but HIGH exhuast stream velocity. A fast-moving but free-flowing gas column in the exhuast helps creat rarefractoin or a negative back pressure wave behind the exhuast valve as it opens. This vacuum helps scavenge the cylinder of exhuast gas faster and more throughly with less pumping losses. An exhuast pipe that is to BIG in diameter has low backpressure but LOWER velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque.

How to get it....
Low backpressure and high exhaust stream velocity can be achieved by running straight-through free-flowing mufflers and small pipe diameters.

Desired PSI...
Some stock mufflers and exhuast systems have up to 18 psi of choking, power robbing backpressure. In direct contrast, a well-designed, high-performance street exhuast typically has about 2 to 6 psi of backpressure. For an intresting comparison, an un-muffled straight pipe on a real racecar usually has 1 to 3 psi of backpressure

 

[GroundControl]

How do I check the psi of my exhaust? Stick my finger behind the muffler? lol

 

[civiceper]

Diameter guide:
1,500cc-2,000cc: 2-inch
2,100cc-2,500cc: 2.25-inch
2,600cc-3,000cc: 2.5-inch

[Add .5-inch when using N20 or FI.]

Pardon my stupidity, what is N2O ? i assumed FI is Force inductions ?

thank's

 

[HybridJDMHonda]

N20= Nitrous Oxide FI=Forced Induction (turbo, supercharger)

To test your PSI take it to your local muffler/exhaust shop and ask them to do it. Should be free. Or maybe like $5bucks. Definantly worth it though.

 

[nauticapinoy]

I was just wondering, cause my boy wants to take his cat off and run a straight pipe to the muffler, and this other guy i know has a straight pipe in his 90 maxima, what are the approx gained power from this. and how would the emissions peeps catch you if your just running straight pipe without a big smoke signal? is it easy for them to catch you?

 

[nauticapinoy]

Diameter guide:

and hybrid jdm I will be swapping a b20 in the near future, should i stick to just 2" piping? will that yield me the most power? cause i'm contemplating of upping my piping now with my pretty stock d16 non vtec. what should i do? how large?

 

[madtownhonda]

the theory that you need backpressure is bullshit....you don't want any backpressure...2.25" will be good for bolt ons unless it's a b18c5.

 

[civiceper]

Thank you guys for your advice. Any advice to put header on a DX ? the O2 censors ? will it work if i make another hole on the header for 2nd censor ?

 

[madtownhonda]

Thank you guys for your advice. Any advice to put header on a DX ? the O2 censors ? will it work if i make another hole on the header for 2nd censor ?

get the EX "spec" header and a 2.25" carsound cat and then get a cat back for an EX and you'll be set....you'll have the Oxygen sensors taken care of then and you'll have a completely new exhaust

 

[chunky]

if you've got a DX, just swap the exhaust for one out of an EX.

how much motor work are you going to do?

2.25 or 2.5 will be too big. Even for an EX 2.5" would be too big unless you were running at least 6psi of boost.

the absolute biggest i would go is 2.0" your stock exhaust is like 1.5" or 1.75"

 

[madtownhonda]

stock exhaust is 1.75"...The stock Si catback is 2"

 

[civiceper]

anyways, i went to muffler shop yesterday, asked the guy to put straight pipe 2.25 " w/ resonator and cost me 'bout $ 100, which is not bad. But if i want to install DC 4-2-1 (which i bought from a friend for $ 100 out of '94 EX), the muffler guy said the header will fits right in and he can modify the 2 O2 censors, with the total of $ 250. Is it reasonable price for custom piping, resonator, carsound cat, and header ?

 

[chunky]

anyways, i went to muffler shop yesterday, asked the guy to put straight pipe 2.25 " w/ resonator and cost me 'bout $ 100, which is not bad. But if i want to install DC 4-2-1 (which i bought from a friend for $ 100 out of '94 EX), the muffler guy said the header will fits right in and he can modify the 2 O2 censors, with the total of $ 250. Is it reasonable price for custom piping, resonator, carsound cat, and header ?

if you wanna go with 2.25" piping, be my guest, but you're just asking for trouble.

you'll most likely loose some power and it won't even sound that great.

 

[civiceper]

is Ractive header and muffler any good for '96 dx ?

 

[HybridJDMHonda]

the theory that you need backpressure is bullshit....you don't want any backpressure...2.25" will be good for bolt ons unless it's a b18c5.

So basically if you need NO backpressure you should just un-bolt your exhuast system right? You NEED SOME backpressure. Its not a theory... its a fact. Go ahead and open up your exhaust; trust me you will regret it. You need back pressure. But everybodys entitled to their own opinon.....