exhaust size?

[scg]

i just got done putting my h22 in my car and i was wondering what size exhaust i should buy for it 2 1/4" or 2 1/2"?

[aero]

I would stick with 2.25, I used 2.5 but i think people usually go for 2.25

[scg]

but if i get one made and it is crush bent should i go with 2.5"? you said 2.25" but i imagine you meant mandrel bent right?

[diza]

i heard somewhere that a rough gauge to go by is 1inch to every 90hp..

[ZigenBallZ]

I have a DC exhaust and it's true 2.25" piping (58mm)... what seems to be the standard is 60mm (2.375") as far as most pre fabbed catbacks go...

Anyways... since the addition of a kamikaze header with a 2.5" collector I've come to the conclusion that the 2.25" test pipe and 2.25" exhaust are holding me back...a bottleneck... it's robbing my mid at least... and this is on an F20A DOHC...

I ran it without the test pipe when I first put it on...so header only... and it was much quicker IMO... loud as all hell but quicker... not much of a loss in tq either... and as you would imagine the mid/high end was wicked...

So I think I'm going to be getting a new exhaust with 2.5" piping or maybe a pre fab catback with the standard 60mm pipes...but a 2.5: test pipe for sure... no more 2.25" piping.. I take back all the good things I ever said about it... It's good for a street only car as it maintains low end tq/power but on any car that tracks or races... go at least 60mm...

[howard20653]

I have a 2.5" without a cat

[deevergote]

2.5" is technically better than 2.25". Like Fizz and Zigen said, 2.25" will give you a little more low end at the expense of high end. I have a 2.5" crush bent setup with a 2 year old standard cat (installed at the same time). The power is nice, and it doesn't feel sluggish on the low end. I've never driven a 2.25" equipped H22 car, so I couldn't say how it compares.

If you plan on spending some money on mods, and doing any sort of racing, I say go 2.5". It will allow the motor to perform as it should.

[scg]

it is just a crusing car so i went with a 2.25" mandrel bent stainless steel system

[ez8o5]

is the apexi ws 2.25 or 2.5

[micksf22accord]

i heard somewhere that a rough gauge to go by is 1inch to every 90hp..

hp doesnt meen shit Its how much exhaust is flowing to what size exhaust you should get

[bracersi]

Anyways... since the addition of a kamikaze header with a 2.5" collector I've come to the conclusion that the 2.25" test pipe and 2.25" exhaust are holding me back...a bottleneck... it's robbing my mid at least... and this is on an F20A DOHC...

I would have to agree with zigenballz, I have the kamikazi 4-1 header with the 2.5 inch collector and just moved from a 2.25 to a 2.5 cat back exhaust and it does make a big difference. I also have a f20a dohc

[xScott]

Im running 2.5" mandrel bent piping, but i cant comment on its effictness since i havent ran it. But i can tell you, most aftermarket Prelude systems are 60mm pipings, so that equates to something like 2.36".

[accordtunerx]

is the apexi ws 2.25 or 2.5

its 2.25".. and i also agree that 2.5" piping has proven more overall HP gain.. but the problem is that its hard finding a 2.5" brand name aftermarket exhaust system. most likely you will need to have it custom fabricated.. but you won't get the benefit of the nicely resonated apexi system.. which I personally will sacrifice a few HP for. but thats me.

[AccordWarrior]

its 2.25".. and i also agree that 2.5" piping has proven more overall HP gain.. but the problem is that its hard finding a 2.5" brand name aftermarket exhaust system. most likely you will need to have it custom fabricated.. but you won't get the benefit of the nicely resonated apexi system.. which I personally will sacrifice a few HP for. but thats me.

The piping on WS is 60 mm, which is 6 cm, which is actually 2.36 inches. Its not 2.25, so while its not like ideal, its still better than 2.25 inch piping.

[accordtunerx]

The piping on WS is 60 mm, which is 6 cm, which is actually 2.36 inches. Its not 2.25, so while its not like ideal, its still better than 2.25 inch piping.

damn.. i feel the ownage. but yeah i didn't even know. you learn somethin new every day.