5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
E-bay headers are an interesting trend. I actually just purchased a set myself and they are very legit. I was able to compare them side by side to a set of Supersprint headers and they looked almost identical. I was also able to determine the manufacturer so if I ever have a problem I know who to call. I haven't installed them yet, but in order to do so and pass emissions I need a high flow cat (something like yours) and to reposition the O2 sensors.
IMO anything is better than the headers that come stock. The ones in the E39 look like two pieces of metal crimped together. I think they're worth a shot.
Hi, thanks for posting. Can you give me a link to your headers or a manufacturer. The price is real good (the ones in my post) and they look great. Here in my country a set of nonames costs about 400$. On ebay the actual shippment cost more but i can still get them for less than 200
Yeah, there really should not be much of a difference between any of these e-bay headers. More than likely the same manufacturer makes them and I know they are modeled off of something else much more expensive.
When I purchased mine I just wanted to make sure the welds on them looked good, and the bends were smooth. I ended up being pretty surprised by the quality. I'm probably going to ceramic coat them and then have my shop fabricate whatever I need to pass emissions.
Well when i bought the car it had no oxygen sensors, they were canceled because i have no erors on OBC. After changing the exhaust and the cat. my emissions were 3 or 4 times bigger, i had to bribe the guy Hope it works next year too
How did you find the changes in performance before and after your exhausts, cat and headers individually? Which part made the biggest inmprovement and what was the best improvemet? Fuel economy, 0-100kms sprint, top end power?
I am interested as I will eventually be doing the same to mine and this info will come in handy I doubt I'll be doing it all at once, prob bit by bit from muffler to header.
So u reckon high flow cat back exhaust system with better flowing mufflers at the rear and upgrading to the M50 kit? Wat exhaust system would you recommend and if I were to get a custom in welded with magnaflow
mufflers an high flow cat, would 3"
all the way be sufficient or is that too large? I got a mate who does alot of TIG and MIG welding he could probably make me a custom
exhaust unless there are good ones available easy to purchase somewhere in Melbourne Australia? Am new to euros jap cars I know inside out but euros I don't know hardly anything lol
The 2,5 and 2,8 engines are limited through the 2 original cats., muffer and intake. By removing the cat. and fitting in a high flow muffer you can get the real power of an 2.5 m50 for example. I don't have all the exhaust changer, i modified the resonator and made it dual exhaust like the M5. It is recomended not to remove the resonator because you will lose torque.
Yeh I can feel that the motor is definitely being held back. I reckon after modifying the breathing it will be possible to unlock up to 50hp? Or am I dreaming?
Thanks for the advice Duxter, will change the exhaust and post before and after dyno results as we have one in the shop here.
Btw - wat is 200cp+? it's another measurent of power I'm assuming, but haven't seen it before.
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