Whiteccord

Should i go catless with a midpipe exhaust- sorry for this n00b question its not loud when it idles but only when i step on it. would making it catless make it more powerful?

dohczccrx

yes you will see a decent difference however it will be alot louder

Whiteccord

so how would i make it catless? buy a new pipe? or stab the cat.

dohczccrx

i dont know what you mean by stabing it but i like gutting cats for two reasons
1. free
2. looks like it is still there for any one who wants to know (cops)

Whiteccord

How should i gut it?

dohczccrx

get a peice of pipe and take off your cat and jam that pipe into the cat and maybe use a hammer to break up the material inside it

FunnyVictor86

youll sound like a ricer and youll lose alot of backpressure which is necessary unless your boosting ...

TheMuffinMan

iTrader: (1)

Yep, backpressure loss = power loss

Not the brightest thing, and you definitely will not see a large increase from stock with the stock motor and piping.

dohczccrx

why do all race cars have not cat? why would you not see an improvment from stock restricting cat from straight pipe. my friends 92 honda accord was running 17s with just intake and exhaust. when he removed it he saw running mid to low 16s not fast but was a huge improvment. so i have no cat on my car should i put it back on and get more horsepower?

TheMuffinMan

iTrader: (1)

Because race cars are designed to NOT have a catalytic converter.

A F22 is designed to have one and is a low compression motor, higher compression motors (IE a race car) breathes better and benefits from free flowing exhaust.

If you remove back pressure you can cause more harm than good.

I really do not believe he saw that improvement solely because he removed a cat, more because he added both an intake and full exhaust from the sounds of it.

You won't see more horsepower (obviously adding it wouldn't increase it) but the car will run better.

And why would you want to gut a thing that fetches 200-300 on ebay because of it's metals? If you're that concerned with having it off then add in a test pipe along with a full exhaust.

I still have my cat on my H22 accord, with no issues.

dohczccrx

he had intake and exhaust on the car for a while then he removed the cat and gained 1/4 mile time. and as far as being built for a cat then why do you gain power with an open downpipe

TheMuffinMan

iTrader: (1)

Haha you don't it depends on the car.

Read what I wrote, higher compression motors benefit from free flowing exhausts. Lower compression motors, like the Accord's F22 do not.

hb_guy

just get a high flow cat and a good resonator. that way you will be legal, gain power and not sound like a ricer

-RedneckDave-

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheMuffinMan &raquo;</TD></TR><TR><TD CLASS="quote">Haha you don't it depends on the car.

Read what I wrote, higher compression motors benefit from free flowing exhausts. Lower compression motors, like the Accord's F22 do not.</TD></TR></TABLE>

You might want to check your info, because all engines benefit from optimizing the intake and exhaust flow. The majority of factory exhausts are too restrictive and you will see gains with a more open exhaust. There is a point where the exhaust gets too big and that is where you will see losses.

TheMuffinMan

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -RedneckDave- &raquo;</TD></TR><TR><TD CLASS="quote">

You might want to check your info, because all engines benefit from optimizing the intake and exhaust flow. The majority of factory exhausts are too restrictive and you will see gains with a more open exhaust. There is a point where the exhaust gets too big and that is where you will see losses.</TD></TR></TABLE>

Where I'm getting at though is the performance aspect I suppose.

The F22 is low compression and benefits less (performance wise) from a larger, more freely flowing exhaust.

The H22 being higher compression benefits more-so (performance wise) from freely flowing exhaust.

dohczccrx

either way there is a performance gain. so besides emissions and noise getting rid of the cat is a good idea

Whiteccord

how much would that run me? high flow cat and resonator

dohczccrx

get a straight pipe with no resonator

91h22cb7lx

when you remove the cat you will lose a small amount of mid range power but you gain a lot on top, this has been argued for years, i think there were dyno charts on cb7tuner?? ill see if i can find them

Merks

I don't mean to jack this thread but since this was on the topic of F22's and back pressure.

My question is, do F22's benefit at all from a more free flowing exhaust? If it does at all is it better to run just a cat back exhaust with stock header or vise versa?

FunnyVictor86

what you want to do is run the same size piping from the downpipe to the exhaust ... otherwise its not going to flow its best ... if your going to put a catback with a stock exhaust manifold your just wasting your time and money