jdm is ceramic coat and is for 295 shipped while comptech is ss 395 shipped.
let me know what ya think. thanks.

 

comptech all the way

 

Well, you need to think ahead alittle before you buy your header. What kind of exhaust do you have or are going to get?

The JDM DC will work better for a 2.5 exhaust and you'll get better hp gains with future mods. The collector is 2.5 while the comptech is only 2. I'm not saying the JDM DC is better because I'm going to buy the comptech myself. But I also have the comptech exhaust and don't really plan on doing much more to my motor right now besides a few mild things.

It's just what I've read on this board. Comptech puts out good numbers but has it's limits is all.

Comptech

 

i am planning to do 2.25 custom exhaust. for now, i am not planning to do go deep. just waiting for a right time. i will go i/e/h and later on, i am thinking about ls/vtec or rebuilt ls engine. i also heard that if i use jdm dc, i would need a flange cuz the angle doesn't fit rite or something.

 

What do you mean? The JDM DC won't fit right to bolt on your stock exhaust?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RuskeR &raquo;</TD></TR><TR><TD CLASS="quote"> What do you mean? The JDM DC won't fit right to bolt on your stock exhaust?</TD></TR></TABLE>

the collector angle doesn't fit right on to the cat. you either need a mufffler shop to put a adpater or a flange. or you can buy type r converter.

 

...also why would you get a header thats 2.5 and get a custom exhaust that's 2.25? It will cause a small bottleneck. I would assume you'd wouldn't gain much if not lose HP.

 

Just get a custom high flow cat. Problem solved.


Modified by RuskeR at 9:47 PM 10/9/2003

 

Comptech makes beautiful things...

 

comptech

 

opinions are like ********...................

 

...everyone has one and if it is not your own then it stinks (for those who dont know how that ends....)

I had the same question a month ago and I decided to go with comptech. It has a high price but Im trying to find one cheap,clean, and used.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ggangtong81 &raquo;</TD></TR><TR><TD CLASS="quote">

the collector angle doesn't fit right on to the cat. you either need a mufffler shop to put a adpater or a flange. or you can buy type r converter. </TD></TR></TABLE>
well, its more like the collector size hat doesn't fit up with the stock USDM cat. It's much too large to mate up.

I'd get the DC and get a highflo cat to fit between. The exit on the JDM is said to be 2.5 but it is really around 2.25 (the USDM is around 1.8), so a 2.25 exhaust isn't really a bottleneck... i's actually very streamlined. A full 2.5 exhaust system would be a better setup, and thats for any teg

for those that didn't know the DC header is a copycat of the 98 spec R OEM header.


Modified by pythonScott at 11:57 AM 10/10/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by snoballgsr &raquo;</TD></TR><TR><TD CLASS="quote">opinions are like ********...................</TD></TR></TABLE>

you ****'em

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pythonScott &raquo;</TD></TR><TR><TD CLASS="quote">

for those that didn't know the DC header is a copycat of the 98 spec R OEM header.
</TD></TR></TABLE>
kind of, but much smoother design allowing for better flow and higher hp gains. BUT DC header hangs much lower than OEM and can not utilize heatshields or skidplates that some places sell.

 

swing vote, went with what I have. the comptech looks great and performs where it is needed most for day to day driving, midrange.

 

it all depends what you're going for....the DC is going to give you more top end, from like 5500-8400 (i have the comtptech ECU so i can rev a lil higher than most GSR's, and the Comtptech is going to give you more in the mid range, say from like 3-6. I have the DC and I love it.

 

I vote for Comptech. Comptech is quality, they do good work, and the header blings. I'd choose it over the JDM header because it seems like it's made with better quality, and it will fit without any problems. I had one and I loved it. I'm trying to find another one (like used in good cond.).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SMZ GSR &raquo;</TD></TR><TR><TD CLASS="quote">
kind of, but much smoother design allowing for better flow and higher hp gains. BUT DC header hangs much lower than OEM and can not utilize heatshields or skidplates that some places sell.</TD></TR></TABLE>
The smoothness would make a negligible differences, IMO. The key is getting a properly sized exhaust system from the header back.

Heres the skidplates from Fastlineperformance.com. Link: http://www.fastlineperformance.com/skidplate.htm

 

I think the biggest issue between the 2 headers is the size of the exit. The JDM DC will trounce the USDM sized Comptech for the 1 reson that the exit is larger. I experienced this when going from a USDM type R header to a 96 spec JDM header. It changed my R swap from a nice engine to a screamer. The difference is night and day when upgrading to a larger exit header if a sufficient sized exhaust follows it.

Comptech does make nice stuff, but in my experience DC has been just as well built.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tachyteg &raquo;</TD></TR><TR><TD CLASS="quote">it all depends what you're going for....the DC is going to give you more top end, from like 5500-8400 (i have the comtptech ECU so i can rev a lil higher than most GSR's, and the Comtptech is going to give you more in the mid range, say from like 3-6. I have the DC and I love it.</TD></TR></TABLE>
DC JDM 4-1 download --- View HP/TQ 187/ 137
Comptech 4-2-1 download --- View HP/TQ 187/ 137
These numbers are dyno proven from the "Great Header Test" So while their peak #'s are the same, yes the Comptech will provide better midrange as well. comptech=

 

The only thing is,that header test is on a typeR.I would like to see a legit dyno of the Comptech unit and DC JDM 4-1 on an almost stock GSR except I/E and a well modded GSR.I have the comptech unit and it made the car feel great right around 5500 to 7k then I feel a slight drop off in power.I was thinking of going JDM DC 4-1 with a carsound in the future.The only thing is I have no issues with the comptech unit scraping and my car is slammed.I've actually ripped my exhaust off from speed bumps but the header doesn't even have a scratch.

 

yikes, if you've ripped off the exhaust before than i really dont recommend the DC. it hangs very low, there was a thread in the ITR forum of my friend having his DC JDM getting ripped open on the freeway (it was on the 99 LS/vtec with H&R sport springs.)

 

I agree,plus I've only had the Comptech for about a year,its still in great shape and I don't plan on doing any heavy mods so I may just go Carsound to complete the exhaust. H&R race that are sagging the front is on the ground and the camber is totally off and everything but the header scrapes .I'm actually going to order some ground controls in a week or 2.

 

comptech