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post #1 of 15 Old 4th December 2017, 02:17 PM Thread Starter
bemone
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New decat headers

Just got these babies from Ryan last week. Sliver ceramic coated really clean. My guy at richmond bmw will start install today.
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post #2 of 15 Old 4th December 2017, 02:28 PM Thread Starter
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Oem headers have some interesting design features notice how the collector is designed to swirl exhaust out the primary tubes. The collector also has anti reversion built in.
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post #3 of 15 Old 4th December 2017, 02:30 PM Thread Starter
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post #4 of 15 Old 5th December 2017, 12:17 PM
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Silly question but how are these different from decatting OEM headers and keep them in place?
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post #5 of 15 Old 5th December 2017, 01:53 PM Thread Starter
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No silly questions! I think you get better flow with the smaller chamber and should make as much power as rpi/evolve setup 28rwp/28rwt. Before tune. My mechanic felt better about this setup then just gutting.
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post #6 of 15 Old 14th December 2017, 05:29 AM
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They look great. for someone (me) who has not spent much time looking at factory headers what exactly is done?

is the cat section cut off the header and then a new pipe and v-band flange section added? or is that still the factory part and it's the post flange pieces that are new?
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post #7 of 15 Old 14th December 2017, 02:52 PM
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Quote:
Originally Posted by Emfiver View Post
is the cat section cut off the header and then a new pipe and v-band flange section added?
Correct. Its a clean setup and proven to make decent power. If emissions wasn't such a b*tch to pass I would consider them.

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post #8 of 15 Old 15th December 2017, 08:22 AM
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I really want to get rid of my header cats and have been thinking about the best way.

I have no problem with the stock headers. they look like an excellent design to me. I just can't stand having a car with 4 cats, especially with 2 right at the headers. I'm used to cars with 1 cat or none.

I have seen some guys just try and break the cat cell up into pieces and remove from the headers with the headers still mounted. is it possible to cut off the cat section and weld in some pipe with headers on the car?

if I go to the labor expense of removing the headers to do it then I'm getting into the territory of probably just buying new headers...
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post #9 of 15 Old 15th December 2017, 11:29 AM
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post #10 of 15 Old 16th December 2017, 06:10 AM
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Quote:
Originally Posted by cold m3 View Post
Correct. Its a clean setup and proven to make decent power. If emissions wasn't such a b*tch to pass I would consider them.


i have catless headers on mine. can't notice any improvement in power.

the sound is a little different thats all, not better, just different (actually i preferred the stock sound).

if i had my time back id definitely have saved 3-4k and not done it.

in these days where you can get 2-300 hp in tune and turbos from the new amgs and BMW's,

whats 20 whp??
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