aFe headers?

[tuphdc]

I hope this isn't a repost, but I just noticed that aFe sells headers for the 128i?

http://afepower.com/shop/details_new...0L&&brandID=99

I can't seem to find a review on these, so feel free to post one here.

[andrey_gta]

it is a repost - see e90post n52 section
The fit is good.
It is unknown if results are measurable.

Their dyno is for afe inatake + headers + stock exhaust e91.

best use of these headers is probably to minimize noise & have "headers "on your loud exhaust if you did secondary cat delete and some no muffler solution.

[TheSt|G]

Just your usual cheap headers. Wouldn't expect more than half a CAT delete in terms of power. Their claims are just silly, though equally optimistic to their dyno.

[Kgolf31]

I don't understand getting a set of headers that still have a 300 cell count within them. Waste of money IMO.

[andrey_gta]

Originally Posted by Kgolf31

I don't understand getting a set of headers that still have a 300 cell count within them. Waste of money IMO.

If one has no secondaries it makes sense. Otherwise its the same as leaving secondaries.

My only concern is Cat placement. If you have a choice - do you place them in the header or secondaries? Most of not all N/A engined M cars seem to do the seconaries...

[tuphdc]

http://www.realoem.com/bmw/showparts...19&hg=18&fg=10

Where is the cat and resonator in this pic? I just see the "box" which I thought was only the resonator.

[andrey_gta]

Originally Posted by tuphdc

http://www.realoem.com/bmw/showparts...19&hg=18&fg=10

Where is the cat and resonator in this pic? I just see the "box" which I thought was only the resonator.

Cat's Are near #5

[tuphdc]

Hmmm so is there a way to get rid of just #5?

[flinchy]

got excited

saw price

saw cats

closed.

waste of money.

[TheSt|G]

Originally Posted by Kgolf31

I don't understand getting a set of headers that still have a 300 cell count within them. Waste of money IMO.

Exactly.

We effectively have a free race cat from the factory. Why artificially restrict yourself with some cheap junky cat?

[Kgolf31]

Originally Posted by andrey_gta

If one has no secondaries it makes sense. Otherwise its the same as leaving secondaries.

My only concern is Cat placement. If you have a choice - do you place them in the header or secondaries? Most of not all N/A engined M cars seem to do the seconaries...

From me reading, it appears you want to ditch primaries as soon as possible, since they provide the most restriction.

For example, in SCCA STX, you have to run cats in OEM places (well within 6" of OEM). But, if you have 2 cats (like my N51 128 does) I can relocate the primary and combine the cat into the secondary.

AKA, I can run superspring headers, and 100 cell count cats in the 1st section and follow the rules, and make a ton of power doing so.

[TheSt|G]

Originally Posted by Kgolf31

From me reading, it appears you want to ditch primaries as soon as possible, since they provide the most restriction.

For example, in SCCA STX, you have to run cats in OEM places (well within 6" of OEM). But, if you have 2 cats (like my N51 128 does) I can relocate the primary and combine the cat into the secondary.

AKA, I can run superspring headers, and 100 cell count cats in the 1st section and follow the rules, and make a ton of power doing so.

Yeah, coupled with some 100 or 200 cell HJS cats in section 1 and you would be pretty well maxing power while staying in your regs.

[tuphdc]

Originally Posted by TheSt|G

Yeah, coupled with some 100 or 200 cell HJS cats in section 1 and you would be pretty well maxing power while staying in your regs.

What are your thoughts on just keeping the stock "headers" (exhaust manifold) and delete the cats in section 1? Is there a common/popular way to do this? It won't cause a CEL would it?

[TheSt|G]

Originally Posted by tuphdc

What are your thoughts on just keeping the stock "headers" (exhaust manifold) and delete the cats in section 1? Is there a common/popular way to do this? It won't cause a CEL would it?

I think it's a pretty shortsighted move for cheapness. I personally would never do it.

Pros
-Gain 2-6hp(which you can't physically feel)

Cons:
-Get nothing near the gains from at proper set of headers(20hp+)
-Eliminate the free factory set of high flow cats that make a catless header install in our cars daily driver friendly in terms of odor
-Rust on the welds in a year or two


It won't cause a CEL as it is after the O2 sensors. The common way to do it would be to cut and weld, which should give you rust on the pipe down the road as I mentioned above.

[Taskmaster]

Originally Posted by andrey_gta

it is a repost - see e90post n52 section
The fit is good.
It is unknown if results are measurable.

Their dyno is for afe inatake + headers + stock exhaust e91.

best use of these headers is probably to minimize noise & have "headers "on your loud exhaust if you did secondary cat delete and some no muffler solution.

Mostly correct. Some may need to maintain the Cats for Emissions and/or Autocross classes

Originally Posted by TheSt|G

Just your usual cheap headers. Wouldn't expect more than half a CAT delete in terms of power. Their claims are just silly, though equally optimistic to their dyno.

False.

Originally Posted by Kgolf31

I don't understand getting a set of headers that still have a 300 cell count within them. Waste of money IMO.

Also false, see my first response.

[Taskmaster]

Originally Posted by TheSt|G

Yeah, coupled with some 100 or 200 cell HJS cats in section 1 and you would be pretty well maxing power while staying in your regs.

Overpriced catalyst that have shown 0 gains over more abundant options like Random Technology. You sure do like to throw around brand names, don't you?

[TheSt|G]

Originally Posted by TheAxiom

False.

Also false, see my first response.

Quick then, time to bolt up that AFE intake for 12hp and 16 ft/lbs of torque!

Originally Posted by TheAxiom

Overpriced catalyst that have shown 0 gains over more abundant options like Random Technology. You sure do like to throw around brand names, don't you?

I don't remember comparing them to RT, but please let us know about your first hand experiences with HJS. I'm eager to see how your hands on experience compares to mine.

And no, I'm not here to "throw around names". I recommend brands that actually make a nice thing. You can find plenty of posts of me trashing companies like HRE back when they made crap products, or any number of modern suspension names like BC and Broadway Static.

*Edit*

I am amused that for a quick Google of Random Technology yielded a link to HPF(lol) selling them, and then a guy on the Prelude forum talking about how they completely failed on him. Not looking great.

[Kgolf31]

Originally Posted by TheAxiom

Mostly correct. Some may need to maintain the Cats for Emissions and/or Autocross classes

Dude, you clearly don't have a clear understanding on the rules of SCCA Autocross.

In case you forgot, I'm doing a full-prep build for STX.

So, here are the rules:

E. Catalytic converters: Any catalytic converters are allowed, but must attach within 6” (152.4 mm) of the original unit. Multiple catalytic converters may be replaced by a single unit. The inlet of the single replacement converter may be located no further downstream than 6” (152.4 mm) along the piping flow path from the original exit of the final OE converter. The extents of an OE converter are defined by the expansion chamber in which the catalyst is contained, regardless of placement within larger exhaust sections. Replacement converters must have a minimum catalyst density of 100 cells per inch and minimum substrate length of 3” (76.2 mm).


AKA - Catless headers and a secondary cat is allowed.

[Taskmaster]

Originally Posted by TheSt|G

Quick then, time to bolt up that AFE intake for 12hp and 16 ft/lbs of torque!



I don't remember comparing them to RT, but please let us know about your first hand experiences with HJS. I'm eager to see how your hands on experience compares to mine.

And no, I'm not here to "throw around names". I recommend brands that actually make a nice thing. You can find plenty of posts of me trashing companies like HRE back when they made crap products, or any number of modern suspension names like BC and Broadway Static.

*Edit*

I am amused that for a quick Google of Random Technology yielded a link to HPF(lol) selling them, and then a guy on the Prelude forum talking about how they completely failed on him. Not looking great.

Well, I did bolt on the AFE intake and it made the most power of any of the 4 intake boxes I tested, this was on top of my stock box with a K&N filter (and charcoal filter) Modified stock box and Injen CAI. The AFE worked and that's all I know of AFE's products.

And I'm glad you found 1 reported failure of a RT product when it's cost and availablility far exceeds those of HJS (which I didn't here about until people started to fanboy Super Sprint products)

So why don't you show me those Super Sprint header dynos on the N52, or those Evolve tuned 128s that make so much power over AA/OE cars, along with break down on how those HJS headers are a superior product to other HiFlow cats on the market. I'll keep waiting.

Does Evolve make a nice product, sure. Does SuperSprint? Of course. Does that mean anything outside of these "Premium" products isn't as good or better - absolutely not.

[Kgolf31]

I don't see how someone can make an argument that 300 cell count headers make more power than catless headers.

[Taskmaster]

Originally Posted by Kgolf31

Dude, you clearly don't have a clear understanding on the rules of SCCA Autocross.

In case you forgot, I'm doing a full-prep build for STX.

So, here are the rules:

E. Catalytic converters: Any catalytic converters are allowed, but must attach within 6” (152.4 mm) of the original unit. Multiple catalytic converters may be replaced by a single unit. The inlet of the single replacement converter may be located no further downstream than 6” (152.4 mm) along the piping flow path from the original exit of the final OE converter. The extents of an OE converter are defined by the expansion chamber in which the catalyst is contained, regardless of placement within larger exhaust sections. Replacement converters must have a minimum catalyst density of 100 cells per inch and minimum substrate length of 3” (76.2 mm).


AKA - Catless headers and a secondary cat is allowed.

If you don't have a car with downstream catalyst (as pictured in the diagram above) then what?

[Taskmaster]

Originally Posted by Kgolf31

I don't see how someone can make an argument that 300 cell count headers make more power than catless headers.

I didn't say that at all.