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Forced Induction Forum Sponsored by Active Autowerke
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Old 04-19-2014, 01:38 PM   #1
rkneeshaw
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Latest opinions on Magnaflow Headers

Pros: have cats, so exhaust isn't obnoxiously loud. High flow cats are supposed to be better flowing than stock.
Cons: Price?

Early on there was someone on here who had trouble with these cats disintegrating on their SC'd application. I can't remember if he ever came up with a solution or not.

Anyone else run these on their SC'd car and have no issues? If so, how many miles have you had them for?

For reference: Magnaflow part numbers 50287 & 50288 or 49758 & 49759
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Last edited by rkneeshaw; 04-19-2014 at 01:41 PM.
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Old 04-19-2014, 01:45 PM   #2
Rob43
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Somewhere in here there is a thread on these with a dyno, I seem to remember these headers only making 3 whp.
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-25-2014, 07:18 PM   #3
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That's not a lot. Almost no point.

Anyone else have any reliability issues?
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Old 04-26-2014, 01:54 AM   #4
Rob43
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Here it is.



http://forum.e46fanatics.com/showpos...&postcount=173


I don't think it's worth all the cost & trouble of installing them for little gain.
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SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-26-2014, 08:20 AM   #5
rkneeshaw
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Huh, I forgot that someone had a N/A dyno in there.

it was Jim Murphy's issues that made me wonder if there are reliability problems with these.

I have ebay headers now (Jet-Hot coated, really sexy looking) but I might be getting old or something because the car is too loud. Its not obnoxious, but during the summer I drive it daily and, well, yeah I'm getting old

So I'm seriously considering going back to a header that has cats to help quiet it down. Obviously these are cheaper than buying new OEM, but the gains are so minimal that I should just find a used set of OEM instead.

However, my long term plan is to install a supercharger kit, so curious if I should be worried about the cats in the magnaflow headers burning out prematurely under boost.
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Old 04-26-2014, 02:43 PM   #6
Rob43
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Your sig. says "Magnaflow", does this mean you have a #16533 ?
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-26-2014, 02:52 PM   #7
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Your sig. says "Magnaflow", does this mean you have a #16533 ?
Yeah, and I modified it a bit by adding in one of those magnaflow mufflers that have the integrated xpipe in place of the x-pipe in the 16533, and it helped with the tone and quieted it slightly, but there's no getting around the fact that the whole thing is straight through from the heads on out. I dont think there's anything I can do to quiet it further except to add cats back into the mix.
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Old 04-26-2014, 02:59 PM   #8
Rob43
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Quote:
Originally Posted by rkneeshaw View Post
Yeah, and I modified it a bit by adding in one of those magnaflow mufflers that have the integrated xpipe in place of the x-pipe in the 16533, and it helped with the tone and quieted it slightly, but there's no getting around the fact that the whole thing is straight through from the heads on out. I dont think there's anything I can do to quiet it further except to add cats back into the mix.

That's so great,.......I was the one that came up with that. Brushcountry/Qik-BMW needed this solution and after some research that's what I suggested to him.

Anyway, I have another solution (That I Use) for you that is CHEAP & effective. I'll look it up, give me about 30 minutes.


Rob43
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SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-26-2014, 03:36 PM   #9
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That's so great,.......I was the one that came up with that.
Yeah that's right! I still have one of the ms paint images you created to illustrate what part of the exhaust you would replace. I created a thread to document the modification at one point.
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Old 04-26-2014, 03:36 PM   #10
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OK, found it.

Look up the "Car Chemistry" exhaust insert, probably at Summit Racing. They offer many sizes & configurations, you want two (2) that have the most "Disc's" on it.


This is my 330Ci street exhaust, I'm using the CC #3D125R
http://forum.e46fanatics.com/showpos...5&postcount=52



Rob43
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-28-2014, 01:23 AM   #11
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Quote:
Originally Posted by Rob43 View Post
OK, found it.

Look up the "Car Chemistry" exhaust insert, probably at Summit Racing. They offer many sizes & configurations, you want two (2) that have the most "Disc's" on it.


This is my 330Ci street exhaust, I'm using the CC #3D125R
http://forum.e46fanatics.com/showpos...5&postcount=52



Rob43
Hey Rob43,

Have you got a before and after dyno using your 3" cutout?
I have seen a few of other cars and it does make a difference, as this will be another one of my future mods.

I like your little drawing.
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Old 04-28-2014, 02:51 PM   #12
Rob43
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Quote:
Originally Posted by rkneeshaw View Post
Yeah that's right! I still have one of the ms paint images you created to illustrate what part of the exhaust you would replace. I created a thread to document the modification at one point.
I just re-read your thread, it was First Rate, good stuff !

Thanks for the acknowledgment.

Quote:
Originally Posted by cosmos328Ci View Post
Hey Rob43,

Have you got a before and after dyno using your 3" cutout?
I have seen a few of other cars and it does make a difference, as this will be another one of my future mods.

I like your little drawing.

I never dynoed just the cut-out, my thinking & the my race car fab shop where I dyno thinks it would be worth 2 to 5 WHP. My main reason for install was sound, my Bimmer is almost stock sounding for regular DD. It also doesn't attract to much attention, I didn't want a Cop Magnet. When I open it up, it's pure Race Car. The funny thing is, I once got pulled over when I was "playing" with a Nissan 370Z, the Cop said he Heard me "open it up". I said No it wasn't me, he had me start my Bimmer up to listen to it; but guess what........it was stock QUIET. It must have been the other guy,....No Ticket.
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 04-29-2014, 04:11 AM   #13
cosmos328Ci
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Quote:
Originally Posted by Rob43 View Post
I just re-read your thread, it was First Rate, good stuff !

Thanks for the acknowledgment.




I never dynoed just the cut-out, my thinking & the my race car fab shop where I dyno thinks it would be worth 2 to 5 WHP. My main reason for install was sound, my Bimmer is almost stock sounding for regular DD. It also doesn't attract to much attention, I didn't want a Cop Magnet. When I open it up, it's pure Race Car. The funny thing is, I once got pulled over when I was "playing" with a Nissan 370Z, the Cop said he Heard me "open it up". I said No it wasn't me, he had me start my Bimmer up to listen to it; but guess what........it was stock QUIET. It must have been the other guy,....No Ticket.

LOL, that would have been so funny, what did the cop say.
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