no cat or cat?

[93accordtuner]

well i have a straight pipe on my car for about a year with no cat...but then came time for emmisions last week. i got it put back on and now it feels different it seems like i have more torque on bottom end but less power on top end. is this true and how is gas mileage effected by having no cat compared to having a cat my gas gauge doesnt work right now.

[TypeG]

it seems like i have more torque on bottom end but less power on top end.

because you do

how is gas mileage effected by having no cat compared to having a cat my gas gauge doesnt work right now.

i don't think there would be much of a differance if any at all. later.

[bruno8747]

Removing the cat on a stock engine wont do any good. You are loosing torque down low but making a little more power up high thats about it. IMO its not worth it unless ur running something good under that hood.

[93CB7]

Losing the cat is good for the track, but not for a DD.

[93accordtuner]

yeah i agree now that i have it back with the stock cat on. im waiting for the shop to put 2.5" custom pipes with magnaflow cat, hp design headers, no resoator, and apex N1 exhaust tip on now.

[accrdpower]

back pressure is your enemy but ur engine needs alittle back pressure to function properly....thats why those umm "special people" lol that have just the down pipe or something or in other cases nothing at all are asking for a severe engine catastrophy.....i have seen what happens with NO backpressure and beleive me.....it is BAD!!!!!!!! slap on a high flowing cat and ur good to go

[93accordtuner]

oh yeah i know all about that...my friend had a crx and he just had the top half of his headers on it and but thats not the worst thing...he turned the headers upside down and took his hood off. he said it was cool having flames shoot out the top of his car (dumbass), well at least it was the last week it actually ran after that LOL.

[WarAccord]

You don't have to rely on a catback exhaust to create back pressure to hold a stronger low end on the powerband. curving a straight flow pipe configuration helps to hold both low and high end.A good straight flow=4.2.1. headers+ 2.3/4 size piping+ highflow catallatic+ resinator will not do any true harm,as to say your lead foot will!
cause in retro spec you little miss chassy doesn't alow your exhaust piping to go straight back there are roughly 3 good curves it has to take to get out the back end of your Cb7's chromed out exhaust tip.

I recommend if your not on your car keeping tabs on whats going on with it like your own body. Get the Catback exhaust port.

(Holding back on the flow creates Back pressure), but if you think im saying that if you curve a pipe with nothing is like having a catback,not what im saying. they both do the same difference,yet have a different out come by a sum amount. the catback is a true hold off in the catback container. while your slowing the rate of exhaust in a different way with a curved pipe like gravity feeding or sipping if thats a better example.
same mechanical thought they put in your home when it comes to getting your water.
My opinion Catback means trying to shoot a pea out a regular sized straw.

[WarAccord]

sorry I need to say 2 things I didn't put more in depth.

1 was the size of piping. I see you all say you like to use 2.5 well in true terms you wouldn't get 2.5 from inside diameter, you would get a good quarter of an inch off(2.1/4). cause the hall itself is 1/8 inch thick material. so yea the math of 2. 1/2 inch piping would be 2.1/4 inside diameters. so I recommend telling the exhaust specialist to use 2.3/4 or even better 3 inch thick exhaust piping.

2 I didn't say something very important, when it causes the outcome of what I was talking about. you will not get a lot of back pressure, but you will get enough from using just a highflow setup like the Resonator.

[koolkoreanked]

Well as far as no cat I ran a header down to a flex pipe and that was it for about half a year... I didn't do it on purpose but the car ran fine. I noticed a power gain everywhere. If your worried about the little bit of power loss down low then launch at a higher rpm.The only way your going to burn valves or break something is if you run no header or run a header thats too short.

[KoNEY]

oh yeah i know all about that...my friend had a crx and he just had the top half of his headers on it and but thats not the worst thing...he turned the headers upside down and took his hood off. he said it was cool having flames shoot out the top of his car (dumbass), well at least it was the last week it actually ran after that LOL.

Bullshit, Honda engines are not Chevy small blocks. You can't just flip the header w/out modification to the header....

[93accordtuner]

oh im sorry, i forgot that you were there when we sawed the mounting flange off the header reversed it and had his dad (who is a master at welding aluminum and other metals "delta") weld the damn header together upside down for shits and giggles cause it was a god damn shit engine getting ready to be swapped. but im sure you remember that since you were there right?

[Accord13&BA4]

You should consider leaving the cat on.
First, you should consider Mother Earth
Second, the whole acid rain thing...
Third, catless is freaking LOUD!!!


Having the cat is 2/3's better than it off...you're not a track racer? are you?

[phatdoughnut]

You dont want to run 2.5" piping on your stock car, its pointless specially if you think just taking your cat out made a difference.

stick to stock. Dont use 3in like war accord said specially on your stock car.

[KoNEY]

oh im sorry, i forgot that you were there when we sawed the mounting flange off the header reversed it and had his dad (who is a master at welding aluminum and other metals "delta") weld the damn header together upside down for shits and giggles cause it was a god damn shit engine getting ready to be swapped. but im sure you remember that since you were there right?

Bullshit, Honda engines are not Chevy small blocks. You can't just flip the header w/out modification to the header....

ON TOPIC: I'd run the Cat, I had mine off and it was freakin loud a nsaty sounding. You do notice a bit of gain though, and your rev is a lot quicker. Personally, I'd run 2.5'' pipe from the cat back, with a good header (hytech, smss, etc..) and run a swap pipe right in front of the cat, so you can run quieter exhaust daily, and just straight dumped header for track, runs, etc...