KidRuthless

Whats the best catalytic converter for a 1997 civic dx Hatcback with a obd2a 1998 Gsr swap? I have oem headers as well.

Swanky_things

a straight pipe no cat just straight out nothing in it... ebay 30$ put a spark plug fouler on as well for your o2 sensor to keep it out of direct stream... essentialy it is like a metal condom that encloses the o2 sensor and pulls it out of the stream to keep it cooler and relate to the computer there is no higher volume of heat coming through your exast stream essentialy tricking it into thinking your running factory settings and thus keeping your light off also can be purchased on ebay for roughtly 15$

doctorake

There really is no "best", I have a magnaflow highflow cat welded in after the header from my B16A. It passed emissions and has never thrown a code. I picked up the one for the same year as my car but the EX version, just had to weld it in.

I would just buy the cat in case you need to pass visual inspection, it is not robbing you of any HP.

Swanky_things

visual inspection don't matter because they are not removing the cat to see its internals they couldn't care less its and aftter market exaust and with thousands of aftermarket components especialy for a vehicle like a Honda who is to say it is not a performance cat as long as the ecu isn't tripping a light your fine although a little back pressure is good to have ... but spending money on a performance cat is a waste just get a straight pipe you get the most bang for your buck

the test pipe is thirty and your gona nut your self over the backfiring when you you get the rpms just right as opposed to a performance cat which youll spend at least 125 to 300 and youll barely notice a result

k.i.s.s.

keep
it
simple
stupid

ya know what I mean

doctorake

You must be new here. Some states actually look to make sure it is in fact a Catalytic Converter. OP asked about CATs so I answered about CATs.

As far as back pressure I suggest you read this.

http://www.hondacivicforum.com/forum...ts-wrong-3064/

NotARaCist

iTrader: (1)

The absolute only word in your entire incoherent ramble of what you seem to consider advice is "stupid". I'm not even going to waste my time trying to pick apart why literally everything you just said is wrong.

OP, get a bolt-in cat that fits your exhaust. Either get an OEM cat, or a Magnaflow. Test pipes won't give you a damn thing other than a louder exhaust. On top of that, they're illegal for use on public streets. Illegal. Period.

Swanky_things

who gives a **** about an extra pony or two when a lightly modified 2.0 t vdub can spank an non modified dual cam b series motor

Swanky_things

doctor ake I read the link you provided and is pretty much my understanding of the topic.... so I don't know what your tryin to explain to me here im just trying to give my two cents of most fun for the bang

TomCat39

H-T doesn't support illegal advise such as the use of straight pipes for daily driving use for all states.

H-T does support following emission standards for any region the poster is in.

OP I will see if I can find another direct bolt Cat option for you other than magnaflow that a user has been using for 10 years without issue. Might be a more cost effective option for you that has been tried and tested true for quite some time. I will get that to you later today.

NotARaCist

iTrader: (1)

You need to sit down, read, and comprehend a good bit more before you start posting. Seriously, you keep giving horrible advice, spreading complete misinformation, and encouraging people to do stupid and/or illegal things. This is a serious technical forum. We do serious technical advice to repair problems. Halfass work is not welcome here. Cheap "quick fixes" are not welcome here.

Swanky_things

who is to say my advise is illegal I don't know where this guy lives all states are completely different as are some counties in some states that are different from counties neighboring them... it is illegal to use recreational marijuana in this state and it is legal in Colorado I am stating basic facts from being inside the industry and knowing how general service facilities operate... now tell me how what I am saying is incorrect

NotARaCist

iTrader: (1)

It's federally illegal. That means it's illegal everywhere within the U.S. You're wrong. Accept it and move on.

Swanky_things

so I got tom cat shutting me down when not a racist is tellin me to sit down and read when I been around the shop game for 15 yrs so shut not a racist down because that last post wasn't a tech post just like you just told me about five minutes ago

Swanky_things

so what are you gona do take every car on the street lift it up and see if their cats are dop approved cars with stand alones running large turbos old classic cars because they fall into a classic car class and thus bypass the todays laws with classic plates on ... so physicaly they put out more carbs but yet on paper theyre ok so who cares if you wanna cry about it just to be right then you win

NotARaCist

iTrader: (1)

The legality of specific modifications is most certainly technical. If you want to see me being not technical, go ahead and take a trip over to GDD - you'll fit in perfectly. As I've already said, you need to stop posting and do a LOT more learning before you even begin to give anyone advice around here.

KidRuthless

Im running straight pipe right now and have a check engine light for the secondary 02. So just keep the secondary 02 connected and cap it with the spark plug fouler? Nothing else?

KidRuthless

Yea the dx models the converter is connected on the header unlike the ex which is after the header. Will I have any issues if I welded a ex cat inlet and outlet sizes to be specific?

KidRuthless

I agree with the cheap fixes lol but oem cat will not work with my gsr swap because the dx CAT is connected to the header. So would a EX magna flow be better in my case?

NotARaCist

iTrader: (1)

Eh, tiny bit more complicated than that, but basically you just install the defouler between the O2 sensor and the cat.

If you convert to an EX-style exhaust (including all B series exhausts), you'll just need the header, and an EX cat. You shouldn't need to weld anything - it should just be a bolt-on affair. The only modification you'll need to make is for the secondary O2 sensor wiring. You'll either need to extend the wiring yourself (fairly simple, just cutting, soldering, and heat shrinking four wires), or buy an extension harness. Extension harnesses can be found on eBay for $20-$30, if you aren't comfortable with (or don't own) a soldering iron.

TomCat39

Or you can make your own extension harness if you go to the junk yards and rip out some of the engine wire harness for one side of the O2 sensor plug, and then cut the wire and plug off the o2 sensor. Then get some automotive wire and do some soldering and shrink wrapping ( I just electrical taped it myself ). Then you have the proper plugs for both sides and can put your O2 sensor anywhere. I think my total cost was about 12 bucks after taxes due to the spool of auto wire.


Took a little digging but that's the name of another company that makes quality direct fit hi flow cats.

218luder

+1 for random technology, i had one on my swapped prelude. worth the money.