which headers for my 02 325ci [Archive]

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icosaca

08-26-2005, 06:13 PM

hy guys, i am thinking in getting headers for my bmw, but i have a couple of questions, what do you thing the power increase may be, 20 hp, 15?? and another question is, which headers do you think are best, supersprint, technik? or if you know of another.
thank you very much.
ico saca

des744

08-26-2005, 06:53 PM

Whatever it is, Racing Dynamics do produce headers that will produce 30+ hp will sofeware tuning. However, for right hand drive cars - they will take forever to produce!If ever at all! Paid them since feb this year. Still no news. Best of all, they do not tell you that it's only for left hand drive. So, beware - all commonwealth countries!!

samir@technik

08-26-2005, 07:20 PM

We just had a GB on headers...it's still possible to get in on this price.

http://www.technikpower.com/news/080205.htm

icosaca

08-30-2005, 01:56 PM

We just had a GB on headers...it's still possible to get in on this price.

http://www.technikpower.com/news/080205.htm
do you think any regular muffler shop can install, or do i need to go to a special place, i live in south florida, what do you recomend???
are youre headers much better that supersprint???

samir@technik

08-31-2005, 01:41 AM

do you think any regular muffler shop can install, or do i need to go to a special place, i live in south florida, what do you recomend???
are youre headers much better that supersprint???

I would definitely NOT let a regular muffler shop install the headers, it's a pretty complex job that should be left to an experienced tech. Our headers are based on the Supersprint design, so the only real difference is the price and the option to have them ceramic coated.

HighBoostin330

08-31-2005, 03:24 AM

What's the benefit of having them ceramic coated? :dunno:

vmwerks

08-31-2005, 09:13 AM

External temps are reduced.... I believe that it will also prevent hot spots on the headers as well.....

08-31-2005, 11:58 AM

this subject has been discussed a plethora of times.
Here's an old thread I posted awhile back that should give you some more information: http://forum.e46fanatics.com/showthread.php?t=218955 .
I would also recommend getting cats. Whatever kind it may be.
I've seen a variety of stock dyno figures for a stock 325Ci, and it has ranged from upper 150hp/upper 150tq, to as high as 165hp/lower 160tq (these are all whp figures, and the lower numbers were from a step I believe).
Considerig that in addition to the headers I have shark/cai/exhaust, the gains are considered to range from 16-28hp/10-20tq.
If you consider a 15% drivetrain loss, that makes it about 18.8-32.9hp/11.8-23.5tq gain towards the crank.

icosaca

08-31-2005, 12:42 PM

HighBoostin330

08-31-2005, 02:41 PM

To my knowledge the cats are used to have cleaner exhaust gas and to prevent CEL light. If you can live with the CEL light on, then you don't need the cats.

bernstem

08-31-2005, 03:05 PM

i alreaddy have straight pyping all the way back to my dinan muffler, meaning i have no kats in my car, how much do you think the performance of my car may increase by installyng headers.
other performance thinkgs i have in the care, are just dinan intake, and dinan software.

The stock catalytic converters are in the exhaust headers. Odds are your cats are still in place and working fine. I would expect if you didn't have any you would be throwing a CEL.

icosaca

09-02-2005, 11:33 AM

ok, so when i get the headers for my car, i will also need to get cats???
do you guys ofer cats too???
thank you.

bernstem

09-02-2005, 02:54 PM

ok, so when i get the headers for my car, i will also need to get cats???
do you guys ofer cats too???
thank you.

You don't need cats, but it can be a hassle if you don't have them. You will likely have a CEL and will probably fail inspection if they do an emissions check.

Technik doesn't sell cats, but if you get hold of them, they can recommend aftermarket cats.