Acura Integra All Integra Except ITR

B18B integra LS stock exhaust pipe diameter?

 
Old 08-30-2007, 11:06 PM
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Default B18B integra LS stock exhaust pipe diameter?

So i'm swapping a B18B into my '99 civic and i want to do it right. I'd like to emulate, or maybe go a little bit higher than the stock exhaust that the integra LS was designed for.

What's the piping diameter on a '97-'01-ish integra LS?
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Old 08-31-2007, 12:42 AM
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they are either 2' or 2.5'
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Old 08-31-2007, 05:08 PM
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Default Re: (Mfoehrkolb)

not helpful
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Old 08-31-2007, 06:14 PM
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Default Re: (Neptronix)

Man 2'-2.5' diameter... thats one big exhaust... but anyway back on topic... when I swapped out my LS cat back im pretty sure the factory exhaust pipe diameter is 2". If anything a little smaller.
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Old 08-31-2007, 08:02 PM
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the stock LS exhaust piping is 1.91 - 2.0 but i would go get a exhaust that is 2.25 or maybe 2.5 but its up to your plans on this motor....
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Old 08-31-2007, 08:34 PM
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Default Re: (SIC_jdm_da9)

most aftermarket exhausts are 2.25-2.36'' anyways so it doesnt really matter. only a handful are 2.5-3''.
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Old 08-31-2014, 01:06 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Does anyone know what the outside diameter is on the exhaust pipe just to the rear of the resonator on a 1991 acura integra LS model?
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Old 08-31-2014, 06:02 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

its 1.75" stock
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Old 09-03-2014, 02:05 AM
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Default Re: B18B integra LS stock exhaust pipe diameter?

I am really getting theee run around on this from these parts companies. I want to keep everything OE. Does anyone know who made the catalytic converter for the 1991 acura integra LS model. And parts numbers for the front gasket and back gasket for this catalytic
converter? Thank god for this website for accurate info!
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Old 09-03-2014, 03:03 AM
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Default Re: B18B integra LS stock exhaust pipe diameter?

About the donut (front side of cat) and gasket (rear side of cat)...go to Advance Auto, or any chain store auto parts store.

About buying an OEM Cat...$700, but they will last 15 years.
Mostly, aftermarket Cats...$225-300, only last 7 to 18 months.

The inside diameter of the "B" pipe is 1 7/8"
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Old 09-08-2014, 05:01 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

thanks safedriver for your input. I will be replacing both the front and back gaskets on the cat for the 1991 acura integra LS model. Are the gaskets identical or different. I am getting two different stories.
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Old 09-08-2014, 05:02 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

I need to take out the battery tray on my 1991 acura integra LS model. Does it just unbolt or is it welded in?
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Old 09-08-2014, 05:13 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Originally Posted by livingcb919 View Post
thanks safedriver for your input. I will be replacing both the front and back gaskets on the cat for the 1991 acura integra LS model. Are the gaskets identical or different. I am getting two different stories.
The front gasket is (very thick) shaped like a donut and the rear gasket is thin, like (a metal wrapped) cardboard.

I don't know about your battery tray.
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Old 09-08-2014, 05:45 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Originally Posted by livingcb919 View Post
I want to keep everything OE. Does anyone know who made the catalytic converter for the 1991 acura integra LS model.
Sankei.

But they do not make the original converter anymore, and have not for many years. Aftermarket is your only option.
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Old 09-08-2014, 05:45 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Originally Posted by livingcb919 View Post
I need to take out the battery tray on my 1991 acura integra LS model. Does it just unbolt or is it welded in?
Two bolts.
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Old 09-08-2014, 05:48 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Originally Posted by livingcb919 View Post
Are the gaskets identical or different.
Different. You've never been under your own car, have you?

The FRONT is a flat gasket, solidly bolted to the A-pipe. The REAR is dished, or spherical. The spherical profile allows the mid-pipe to swivel like a ball-joint so as to relieve flexing stresses on the system.
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Old 09-10-2014, 07:05 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Originally Posted by safedriver View Post
About the donut (front side of cat) and gasket (rear side of cat)...go to Advance Auto, or any chain store auto parts store.

About buying an OEM Cat...$700, but they will last 15 years.
Mostly, aftermarket Cats...$225-300, only last 7 to 18 months.

The inside diameter of the "B" pipe is 1 7/8"
sorry, that's what i meant. it is 1 7/8"
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Old 02-03-2019, 05:08 PM
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Default Re: B18B integra LS stock exhaust pipe diameter?

Magnaflow makes a stock cat and a cheaper universal one.Just look up your car on their page for a part # then buy the part # off ebay.Magnaflow ones last about 100,000 - 150,000 miles.I use them as a courier and I drive 70- 80,000 miles a year for work.
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