08 Civic Si Muffler and Resonator

[Losiracer2]

Well I found a deal I couldn't pass up. I found an 07' Civic Si Sedan Catback with muffler and B pipe w/ resonator w/ only 49k miles on it. I want to incorporate this onto my coupe somehow.

How would you guys fit this onto the CB chassis? I know the resonator will have to be relocated, most likely to the straight portion of the pipe. Or I might need a whole new B pipe made with the resonator welded on. I think the muffler might need to be extended a bit as well because when I tried test fitting it, it seemed short about 3-4 inches.

Resonator measures 5" diameter by 16" in length. Muffler is 12" long by 10" wide x 8" high. The tip even looks pretty sweet, fills the CB7 rear cutout nicely.

But here it is:

[Nurega]

I don't have much advice regarding the resonator, but Benjerman112 installed a Si exhaust (muffler only, I believe) onto his coupe (with an H22A4). You can probably PM him regarding fitment questions. He has a youtube video with the exhaust sound; I'll try and find it.

I personally installed a 2003 Civic Si muffler onto my car, and kept the original Accord resonator. The muffler is about 3-4 inches shorter than the original EX muffler, so it sticks out less (as you can see in the video). That said, welding in new hangers and a flange wasn't a big problem at all. The sound is barely louder than the stock EX muffler, and it adds an angry bark just off idle.

=> Long story short, the muffler itself can be easily installed by a muffler shop. The Si resonator wasn't needed in my case, and I don't think you'd see much benefit by replacing a stock Accord one with it.

My installation: (EP3 Civic Si muffler with stock Accord catalytic converter, midpipe, and resonator)


Benjerman112: (2008 Civic Si muffler bolted to H22A4, not sure about resonator)

[Losiracer2]

I don't have much advice regarding the resonator, but Benjerman112 installed a Si exhaust (muffler only, I believe) onto his coupe (with an H22A4). You can probably PM him regarding fitment questions. He has a youtube video with the exhaust sound; I'll try and find it.

I personally installed a 2003 Civic Si muffler onto my car, and kept the original Accord resonator. The muffler is about 3-4 inches shorter than the original EX muffler, so it sticks out less (as you can see in the video). That said, welding in new hangers and a flange wasn't a big problem at all. The sound is barely louder than the stock EX muffler, and it adds an angry bark just off idle.

=> Long story short, the muffler itself can be easily installed by a muffler shop. The Si resonator wasn't needed in my case, and I don't think you'd see much benefit by replacing a stock Accord one with it.

My installation: (EP3 Civic Si muffler with stock Accord catalytic converter, midpipe, and resonator)


Benjerman112: (2008 Civic Si muffler bolted to H22A4, not sure about resonator)

yeah i remember you posted this info in my RSX muffler thread lol.

The problem is, I'm selling my RSR EX Mag, so I won't have an accord mid pipe to connect to so I'll need to figure out how to incorporate this resonator, because without it, it'll sound ricey for sure.

[cuate01221]

yeah i remember you posted this info in my RSX muffler thread lol.

The problem is, I'm selling my RSR EX Mag, so I won't have an accord mid pipe to connect to so I'll need to figure out how to incorporate this resonator, because without it, it'll sound ricey for sure.

You definitely want to run a resonator, and you might as well use that one. I think you will be able to use that straight part of that exhaust but not much else.

[MikeW]

Use just the muffler and just the resonator. Cut both the bitches off and weld them to custom bent pipe.

Problem solved.

[illwitit247]

nice

i have a 08 civic non-si rear section on my cb coupe i had all new pipe done from the header back n the muffler needed new hangers welded to it ill post close ups on my page asap,

[illinois_erik]

Is the muffler filled with water??Or is there some trippy optical illusion?

[Losiracer2]

Is the muffler filled with water??Or is there some trippy optical illusion?

Thats some trippy Jedi mind trickery there. No its not filled with water lol. Its the tip of the muffler, optical illusion?

[Losiracer2]

I'll be willing to do this as long as it won't cost me more than 300 total. I have a 100 invested in the civic catback right now. Think i could get a pipe made, welded up and hangars attached for under 200?

[illinois_erik]

Thats some trippy Jedi mind trickery there. No its not filled with water lol. Its the tip of the muffler, optical illusion?

LoL yeah, it doesnt look like its just a hole, like theres water in it, thought maybe you were looking for leaks ah well must be me ive been up like 22 hours now

[MikeW]

Kai, if you can't get pipe welded and hung for under $200....we're in trouble lol.

[Losiracer2]

Kai, if you can't get pipe welded and hung for under $200....we're in trouble lol.

yeah I was hoping to get this done for 200 total. If they charge me around 200, i'm definitely getting a second quote

[Nurega]

yeah i remember you posted this info in my RSX muffler thread lol.

The problem is, I'm selling my RSR EX Mag, so I won't have an accord mid pipe to connect to so I'll need to figure out how to incorporate this resonator, because without it, it'll sound ricey for sure.

oh, my apologies! I didn't remember if that was your thread from before.

Welding the system in should easily cost less than $200. I recommend taking the entire exhaust system (without cutting it up) to an honest muffler-shop guy and having him cut/weld it in. Once they get it up on a lift, they should be able to cut it to size with the proper flanges.

[noahrexion]

Would you be willing to provide some ID (internal) measurements of the piping?

I miss my 07' 4DR Si, and would certainly like to have a stock Si muffler/res on my H22 CB if I could find one. I don't want anything less than 2" ID though and I fear it would be.

Preferably (beggars can be choosers?) - ID/OD piping and ID of the muffler section in and ID of the muffler tip out.

Thanks so much in advance!

[Losiracer2]

Would you be willing to provide some ID (internal) measurements of the piping?

I miss my 07' 4DR Si, and would certainly like to have a stock Si muffler/res on my H22 CB if I could find one. I don't want anything less than 2" ID though and I fear it would be.

Preferably (beggars can be choosers?) - ID/OD piping and ID of the muffler section in and ID of the muffler tip out.

Thanks so much in advance!

I know the ID inlet of the muffler is 50mm, so about 1.98"...I'll have to check the other dimensions