How many of you are running a DC header for a H22a and have done the 2 1/2" collector mod? I have done it and noticed that I can now spin into 3rd gear instead of a chirp (I know this is a stupid way to measure an increase or not). I haven't done any dyno runs yet, But I also notice the A/F meter running a little leaner in the upper RPM range. The car feels a lot faster IMO... Any additional thoughts?

 

How did you modify it?

 

Basically, I had the collector on the B-pipe cut back to almost its widest point and had a piece of 2 1/2" piping welded there instead of the 2". I also had a 2 1/2" flex pipe added as well. I'll try to post a couple of picture later.



[Modified by 2point6, 8:51 PM 7/1/2002]

 

Sweet
Lets see pics

 

I took the pics...Hopefully they will be up tomorrow. Sorry for taking so long. I will tell you this the improvment has been very noticeable

 

Scott:

I want to see those pictures!!!

Regards,
Mark

 

 

that's it, my header goes to the exhaust shop before is gets bolted back on.

 

are you running some sort of high flow cat? or are you somehow merging it back to fit to the 2" stock cat?

 

I am running a High flow cat.

 

Which one?

 

It is nothing special, It is called a Mor flow.

 

So Scott do you still need the 3" Flex Section?

 

Yes.

 

Just checking I should be ordering some stuff this next week so I will pick one up for you. Also I got my new welder so I can hook you up on that also.

I'll post some pics of Mike's 3" Exhuast on Type R later.


[Modified by Hyundai4G63T, 4:24 PM 7/2/2002]


[Modified by Hyundai4G63T, 4:24 PM 7/2/2002]

 

thats mine that i modified

 

Guys, this isn't a bad idea. But what I think you should try to do is not go so big with the tubing at the collector. The secondaries are only 1-3/4" and then dumping into a 2-1/2" tube is a pretty radical jump. Try going with some smaller tubing out of the collector and then stepping it up to your final size.

 

Hurry and finish the 4-2-1 header...HEHE! then we don't have to worry about this.

 

I think Corey is going to sell the 4-1 on eBay soon.

 

but who would buy it when you need to cut that hole in the subframe? heh =]

 

It will be sold with a sub frame swap.

Or maybe someone with a hybrid.


[Modified by SMSP, 7:16 AM 7/4/2002]

 

How much?

Regards,
Mark

 

I would like to see a dyno with the DC modded header. The DC header should make for real nice exhaust flow with a 2.5 dust collector welded on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SMSP &raquo;</TD></TR><TR><TD CLASS="quote">Guys, this isn't a bad idea. But what I think you should try to do is not go so big with the tubing at the collector. The secondaries are only 1-3/4" and then dumping into a 2-1/2" tube is a pretty radical jump. Try going with some smaller tubing out of the collector and then stepping it up to your final size.</TD></TR></TABLE>



So what if we got a transition for the secondaries, to bring it from 1-3/4" to 2 1/2", and then a 2 1/2" collector.

 

i did this also and i notice a difference on the butt dyno. Especially in the high end. I replaced the flexpipe and put a 2.5". I did this a couple months ago and i will get it dynoed within a couple weeks.

Dc modded=