swapping DC 421 w/ A4 header

[Losiracer2]

I want to swap the A4 header with the DC sport one i have currently, will this be possible... if i just use the upper portion of the A4 and the downpipe of the DC? I want to get rid of that raspiness factor so i'm thinking that would work. I know i might lose some HP but it wont be a lot right? reason i'm asking is the damn junkyards always cut the cat off of the cars, rendering the downpipe and exhaust piping useless. I can easily get an A4 manifold though.

[NorcoAccord]

I would see if you can find a bolt pattern of both and see how close they are, I think they will fit, and if they don't it probably wont be of too much. In other words if it doesn't fit drill the whole a little bigger and use a lot of copper spray.

[JDM_CB7_TX]

Quick question.....Why would you go with the aftermarket header if the a4 and the a6 header are gonna work just as good if not better.The only company that I know would have a huge improvment and it has been proven. It would heve to be BISMOTO. Atleast that is what I have read on this forum.

[NorcoAccord]

SMSP is another good company but you pay threw the @ss for it.

[JDM_CB7_TX]

I would probably stick with the bismotos' they look sick and IMO are reasonable.

[JDM_CB7_TX]

Maybe someone can correct me if I am wrong but research has shown that bismoto has got one the best setups if not the best. Most others aren't going to be that Big of a difference IF ANY.

[91 EX-R]

Quick question.....Why would you go with the aftermarket header if the a4 and the a6 header are gonna work just as good if not better.The only company that I know would have a huge improvment and it has been proven. It would heve to be BISMOTO. Atleast that is what I have read on this forum.

the A6 just has an exhaust manifold like the A1. only the A4 had a tubular header.

plus i dont think the Bisimoto headers are available yet. i know that HondaFan is supposed to get his in October and thats going to be the first one given to the public.

[NAiL05]

SMSP is another good company but you pay threw the @ss for it.

If your lucky enough to get them to make an F application for you which I am sure will cost an arm and a leg because it will be custom. Best bet is bisimoto.

[NorcoAccord]

I want to swap the A4 header with the DC sport one i have currently, will this be possible... if i just use the upper portion of the A4 and the downpipe of the DC? I want to get rid of that raspiness factor so i'm thinking that would work. I know i might lose some HP but it wont be a lot right? reason i'm asking is the damn junkyards always cut the cat off of the cars, rendering the downpipe and exhaust piping useless. I can easily get an A4 manifold though.

If you want to lose the raspiness throw on another resonator, that will help, also keep the cat and have a good muffler and you will be in good shape.

[Losiracer2]

yeah as my setup stands right now it's

1) AEM CAI w/ bypass
2) DC Sport4-2-1 header w/ downpipe
3) Type-X straight pipe 2.5 in
4) Greddy Evo 2 2.5 in Catback

I get the raspiness from 2-2500 Rpm in 1st and 2-3K rpm in second and after that it lets off and its a nice deep tone. So to put a resonator on would i have to hack up my Greddy exhaust? i'm kinda scared to do that

[Losiracer2]

i still have my cat, so should i put that back on? I kinda like how loud it is w/o the cat. I did notice the raspiness increased but noticed a little power increase and have an increased burble which i like when i let off the gas on the highway.

[Losiracer2]

Quick question.....Why would you go with the aftermarket header if the a4 and the a6 header are gonna work just as good if not better.The only company that I know would have a huge improvment and it has been proven. It would heve to be BISMOTO. Atleast that is what I have read on this forum.

A1/A6 header from my knowledge is not as good as the A4. they're just 4-1 pieces (non-tubular), A4 is 4-2-1 (tubular), which is better. I bought my DC header wayyyy back in 2004 before i knew about this website and much about my car. Bisimoto headers are good, but WHEN are they gonna be available? people have been talking and talking and nothing yet. And I heard $600 floating around for the cost of it? too much for just a std. bolt on for me right now. besides i just want to get rid of that raspiness i have at a certain RPM.

[rudy1980]

The DC header will not bolt up to the stock downpipe, the header itself is longer or shorter, I don't remember, but the bolt pattern is the same. I think it will work with the H23 downpipe.

I'll have to check tomorrow, I gave my DC to my freind and he put it on a H23 in a civic.

[Losiracer2]

The DC header will not bolt up to the stock downpipe, the header itself is longer or shorter, I don't remember, but the bolt pattern is the same. I think it will work with the H23 downpipe.

I'll have to check tomorrow, I gave my DC to my freind and he put it on a H23 in a civic.

No i think you've got it flipped, i want to keep the DC downpipe but change the upper portion to the A4 manifold. I mistakenly threw out my A6 header and downpipe in the dumpster right after i got my new DC header...shoulda kept them.

[rudy1980]

A1/A6 header from my knowledge is not as good as the A4. they're just 4-1 pieces (non-tubular), A4 is 4-2-1 (tubular), which is better. I bought my DC header wayyyy back in 2004 before i knew about this website and much about my car. Bisimoto headers are good, but WHEN are they gonna be available? people have been talking and talking and nothing yet. And I heard $600 floating around for the cost of it? too much for just a std. bolt on for me right now. besides i just want to get rid of that raspiness i have at a certain RPM.

The A6 is 4-2-1 cast. The manifold itself is cast and the downpip is tubular which is the 2-1 part.