EP3/DC5 header [Archive] - K-Series Forums

: EP3/DC5 header

04-17-2006, 06:58 PM
I have been looking at getting a DC sports shorty header for my EP3 and noticed that the RSX base and the EP3 have the same part number, but the type-s has a different part number... does anyone know the difference? Also I plan on going K20A2 down the road and wondering will I need to get a different header when i do so? Only thing i could think of is that the runner might have a bigger diameter since the type-s makes more power..

04-17-2006, 07:42 PM
4 bolt holes vs. 3 on the mounting flange where it meets the downpipe, and they are in different positions -- also I think the Type-S downpipe may be wider; the end fitting where the downpipe/donut gasket go is about the same diameter of the collector, but on the EP3 one it looks like it steps down.

04-17-2006, 08:40 PM
if you got the type-s header and down pipe wouldnt it fit?

04-17-2006, 10:55 PM
yes it should, but then how about matching up the exhaust

04-18-2006, 01:24 PM
So if i go to a K20A2 down the road all the Si exhaust components should still work together?

04-21-2006, 08:19 AM
For an A2, here's what I would score:

A2-specific header, downpipe, and cat;
Type-S midpipe;
keep the stock axleback.


A2-specific header/downpipe/cat combo;
JDM CTR-spec catback.
(this is what I have now)

The base RSX and Si header/cat sections are the same. The Type-S (actually, K20A2, which also includes the euro CTR) header/cat section is about 3-4" longer overall and has a significantly larger diameter.

Additionally, the JDM DC5-R (aka ITR) header/cat section is a true 4-2-1 design. It's said to have clearance problems with the stock Si front sway bar, though, because there are two pipes going under the sway instead of just one. In this case, the ITR front sway would fit if you also got the ITR lower control arms, because of its different mounting points. There's another company -- I keep thinking Comptech -- that makes a sway bar that would fit over this header, but uses the stock LCAs.

04-21-2006, 08:48 AM
That sounds good, but If I had an EP3 header and ended up getting an A2 motor would I still be able to use the EP3 header with the EP3 exhaust.. I mean I should be able to since all the head bolts are the same and it shouldnt sit any different in the engine bay...

04-21-2006, 08:54 AM
I don't know if the A2 motor has two bolt holes for an exhaust bracket.

The A3 header-block bracket -- the one that bolts up between the end of the header and the lower part of the block -- has four bolts total, two on the header flange and two on the block. The A2 bracket has just two bolts, one on the flange and one on the block. Check out the exhaust manifold parts page for the RSX at acuraautomotiveparts .org to see what I mean.

Other than that, the A3 header will bolt up to the head of the A2. I'd consider eventually getting A2 exhaust parts to take full advantage of the new motor, though.

04-22-2006, 01:07 AM
When you say A2 exhaust part are you meaning stuff for an RSX? And thx for the info i completely forgot about looking on majestic honda and stuff.

04-22-2006, 06:18 AM
Yup, because the header/cat section is motor-specific, not chassis-specific, and the Type-S has the same motor as the Civic Type-R. And, it's just a lot easier to locate Type-S parts here in the US than it is to try and find CTR parts.

And it doesn't have to be the stock parts, either; DC race header, Toda, Mugen, whatever -- as long as it's designed for the Type-S, it can combined with a CTR-spec catback on our EP.

Because of the cost of an OEM cat, I would only get one that's used. Majestic Honda is good for getting replacement gaskets, crush washers, brackets, etc.

04-22-2006, 03:27 PM
I plan on going skunk2 exhaust and I dont think they make a CTR spec cat-back. What header/cat/exhaust setup are you using?

04-25-2006, 09:12 PM
just get a dc5 rh now and cut some off the skunk2 mid pipe. thats what my friend did

04-26-2006, 07:19 AM
why not just get a EP3 DCRH and still use the EP3 exhaust. I dont see why it wouldnt work with an A2 motor.

04-26-2006, 07:39 AM
I've been told that the exhaust ports on the A2 are larger than the A3. Using exhaust parts for the A3 will still work, but if you want that extra little bit, start accommodating the A2's needs.

04-26-2006, 08:02 AM
thanks i'll be doing some more research into this option

04-26-2006, 01:42 PM
the ep setup will work, but the ep header is gonna rob u of a lil power

04-26-2006, 06:59 PM
if its no more than 2-3hp then I dont feel its worth cutting up the $400 exhaust system. also I did a little research and found that pretty much all catbacks for the EP3 and DC5 are 63mm so I feel the EP3 spec catback would be better for fitment... would just have to cut it like everyone sais if I ended up going with the DC5 race header.

04-26-2006, 09:33 PM
i would get buddy club cuz it is 65mm inside diameter compared to others being 65 outside diameter showstoppers has it for $440 shipped

04-26-2006, 09:37 PM
hey laep3 hit me up on yahoo j_roc_70454 or aim jroc04si

04-27-2006, 07:36 AM
I read that the EP3 pro-spec buddy club exhaust is only 2.25"

04-27-2006, 07:43 AM
no, as far as i know its 65mm. call showstoppers or look it up on the net

04-27-2006, 07:46 AM
could you get on aim or yahoo.. thanks

05-25-2006, 11:49 AM
Can anyone give me a rundown of which companies make an exhaust for the CTR spec EP3? Getting close to the point where Im looking into doing the exhaust setup and want to buy the right stuff that will work best if I do an A2 swap. Thx

05-25-2006, 03:49 PM
You may have to ask a vendor specifically, but generally, it'll be CTR-spec if it's made & sold for a home market for the CTR.

If they say "made for Civic Type-R, does not fit the Si", then that's what you'd want.

I can only think of Mugen and Fujitsubo off the top of my head, but I know there are others (probably Buddy Club, J's Racing, RSR, etc).

05-25-2006, 05:36 PM
Thanks again. I think I'll have to check those out, but right off the top the buddy club will probably be my choice.