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Honda Civic EK1
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Discussion Starter #1
Hi all, new to the forums! I was looking into a new manifold 421 was wondering what to do with the cat? can it go under the car or would i need one specifically to go under the car? Want to avoid a decat if possible. Sorry if its silly question, new to the whole fixing up cars let alone hondas :biggrin: :sign4:

Thanks for the help in advance! :winkiss:
 

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BATSLOMAN GIVES NO FUCKS.
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4,052 Posts
safe to assume you have a y7 style header?


you can run a 4-2-1 but you have to find a high flowing cat new, or any other d series cat that wasn't y7
 

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Honda Civic EK1
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Discussion Starter #3
Had a quick look just cant find them, all i seem to get is decat pipes. Is there an advantage to decat or will you just need to put one on for an mot? Im in the uk so dont know if its hardened to get that stuff here? Thanks for you help sorry if i sound dumb!
 

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Prelude, Integra DB9
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366 Posts
One of our Preludes used to go through the MoT OK with a decat. You just need to make sure it's running as it should.

On the other hand, a Civic owner near me fits his cat for the test, then takes it off. I don't know which D series he has.
 

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endo_bobo
1998 Civic Sedan
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877 Posts
What year? If it is a Y7 style just get a cat for after the downpipe and get a catback exhaust system and be good to go.

The cat ain't good for much in my opinion except for EPA bullshit but there is a marginal HP gain for not having a cat.
 

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Honda Civic EK1
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Discussion Starter #6
Its a 97, y5. Didnt want the messing about really, catback might be the way to go i see a few for sale
 

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5,879 Posts
I have a d16y8 header that slo-eg8 shipped to me, hooked to factory style dx midpipe and muffler.

You can definitely just go header to stock exhaust.

Beware that the ebay headers do NOT like sealing properly to stock style midpipes. I suggest going to a partsstore and matching the ebay donut gasket with something a bit thicker and crushable.

Also, use spring bolts like normal exhaust. straight bolt and nut is a leak waiting to happen under the car.
 

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Discussion Starter #8
Thank you helps a lot! Hopefully getting a japspeed one will look into the gasket already trying to get one for my inlet manifold to :)
 
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