Reply With QuoteHave you had your car on a dyno already?
so with the accident my car was in the stock exhaust system was trashed. I took this opportunity to upgrade to a Milltek Muffler and Section 2 and euro cats and Supersprint Headers. Main benefit of the supersprints and euro cats? For cold start emissions US cars get shafted with the cat in header design leaving a lot of restriction in the exhaust and a lot of HP on the table.By relocating the cats to the section 1 with the euro cats and upgrading to a supersprint header I am supposed to net close to 25 HP. Heck they are claiming the header alone over the euro version nets 19. We will see, but there have been favorable reports.
http://www.m3forum.net/m3forum...86709
http://www.europeancarweb.com/....html
anyways on to the picturesstock NA headers (top image)
my new supersprint headers
and mated to the cats
fingers crossed
Have you had your car on a dyno already?
Quote, originally posted by MylesPH1 » Have you had your car on a dyno already?
x2. Don't forget to do a before/after.
"Hard to be humble when you're stunting on a JumboTron"
no dyno close, at least that I can find. Vortex, do you thing. See what you can find. If it is not ridiculous money or distance, I will do it...
They made over 100 hp/L with THOSE headers?!?!?! That's impressive.
you know what? There is no way those are the E46 NA headers. I just grabbed an image of google but those are not right, let me see what I can find.
Quote, originally posted by muffintop » Those look like full 3" headers 
Huh?
"Hard to be humble when you're stunting on a JumboTron"
ok, here are some better examplesCSL vs NA
http://m3forum.net/m3forum/showthread.php?t=151391
This particular poster is on a mission to make a CSL NA car and goes into detail the gains made in the exhaust. There were lengthy discussions on M3forum.net over whether there was any more gains to be had over the CSL header by going with the Supersprint until Supersprint posted up some dyno results that quieted all the critics.
Problem is that up until recently a Supersprint header cost close to $3k!!!
Modified by UKGTI at 10:08 PM 2-8-2010
Modified by UKGTI at 10:19 PM 2-8-2010
Quote, originally posted by JustinCSVT »
Huh?
compensator
Quote, originally posted by UKGTI »
compensator
I'm just wondering what he was talking about. Never heard of full 3" headers before.
"Hard to be humble when you're stunting on a JumboTron"
Quote, originally posted by JustinCSVT »
I'm just wondering what he was talking about. Never heard of full 3" headers before.
Im sure he means the downpipe is 3". The primaries are probably 1 3/4 or 1 7/8 if they're wild. (using my LSX knowledge)
Originally Posted by E90BMW325i
Quote, originally posted by Internal Combustion »
Im sure he means the downpipe is 3". The primaries are probably 1 3/4 or 1 7/8 if they're wild. (using my LSX knowledge)
If they use 1 7/8 I'll eat my hat.The downpipe is probably 2.5".
"Hard to be humble when you're stunting on a JumboTron"
Nice truing stand!
Quote, originally posted by titleist1976 » Nice truing stand! ha cheers, pictures of my roof hucking days in the background too.
How hard are those to install and uninstall?
I ask because those ain't passing SMOG visual without a "tip."
I probably don't know what I'm talking about (but I know more than you)
Rainbow Farts - Team My Little Pony
The Supersprint stepped headers are the latest ones they have, and those look sexy. I'd love to go for those, but I figured, I'd rather do maintenance first in my case (planning on a valve adjustment, new shocks, new rear-shock mounts, diff and gearbox oil change, coolant flush, and new air filter in a few months - car is at 72500).
Quote, originally posted by UKGTI » ha cheers, pictures of my roof hucking days in the background too.
I saw those, too. No wonder why you need a Park stand. hahaha
And, still love the BMW. Glad to see you got her back and happy with the work!
His M3 was only putting down 230 stock??????
Quote, originally posted by UKGTI »
pictures of my roof hucking days in the background too.
Previously known as Son of a B...5er!
Quote, originally posted by stumyk » His M3 was only putting down 230 stock?????? He who, Horton?
These pretzels are making me thirsty!
Have you got a baseline dyno to compare the new headers to?
Quote, originally posted by muffintop » Those look like full 3" headers 3" headers huh, primaries and all? Must have a full on John ****ing Force nitro burning engine in that thing, then.
For a dyno I can recommend GT Pro in Fullerton, http://www.gtpro.com, they are very competent. Eurosport in Anaheim also has a decent setup, http://www.eurosportacc.com.
I hope you're getting software to go with the heads/cats otherwise the S54 will not play nice. I'm also highly doubtful of the 25hp gain claims. Most of the difference between the US-spec's 333hp and the Euro-spec's 343hp comes down to different measurement calculations. The headers and cats should yield a bit of hp though.
PSN: PhilipGTI
Sweetberry - Team My Little Pony
Should be nice. Part of me almost wants my Miata's warmup cat to die so I can get rid of it (it was required only in california, and 2001+ cars don't have it, so I'm pretty sure it's verging on unnecessary).~40lb iron manifold and warmup cat:
2001+ factory manifold:
Spot the illegal modification!:
Splinter - Team Post-Killing Ninja
Help clear my driveway: 1994 Chevy beater truck
Quote, originally posted by Fritz27 » I hope you're getting software to go with the heads/cats otherwise the S54 will not play nice. I'm also highly doubtful of the 25hp gain claims. Most of the difference between the US-spec's 333hp and the Euro-spec's 343hp comes down to different measurement calculations. The headers and cats should yield a bit of hp though.
wrong and um wrong. K thanks
I will be doing my inspec II here in a few thousand miles too, but since ins was paying for the exhaust, I found this route was the most fun!In regards to SMOG, it will depend on who you ask. Finding a tech who will know the difference between the cats in the midpipe and cats in the manifold is slim, and there are many who are passing SMOG with euro cats. It will be a crapshoot
the E46 doesn't play nice with the dyno. When I had mine done it essentially showed the same thing. If all 4 wheels aren't spinning, the car thinks you are on ice or something and cuts fuel at like 4700rpm or something ridiculous.
Quote, originally posted by stumyk » His M3 was only putting down 230 stock??????
TCL3.0 compliance status: Pending QA
Quote, originally posted by UKGTI » I will be doing my inspec II here in a few thousand miles too, but since ins was paying for the exhaust, I found this route was the most fun! In regards to SMOG, it will depend on who you ask. Finding a tech who will know the difference between the cats in the midpipe and cats in the manifold is slim, and there are many who are passing SMOG with euro cats. It will be a crapshoot
I think he was referring more to the headers, not the location of the cats. When the tech looks up under the car and sees this coming down from the head:
Common sense will probably tell him that's not stock.
ya, but with the M3 their is pretty significant engine covering from underneath. The headers are actually hard to see.Not that I have had a tech crawl under my car recently anyway, always just get the sniff test.
Not too worried about SMOG, it is over a year away anyway and I know this config will run clean.
I did this to my Z4MC S54 in December and picked up 17 whp on a Dynojet (SAE corrected). The best part was that there were gains throughout the power band and low end torque. Stock section 2 cats, stock resonator and stock mufflers and OE ECU/DME.I replaced the OE headers (with integrated cats) to the Euro M3 headers. And relocated the 2 post cat and EGT sensors to after the secondary set of cats under the car. No CEL and readiness appears to be set.
Best bang for the $$ mod on these S54 motors IMHO ... love it
OE - You will be very pleased and look forward to your results.
2 runs with headers ... first run I had wheel spin on the dyno since tires were still wet from the rain and hence the dip.
SAE
Uncorrected
Comparison vs Stock - SAE
Quote, originally posted by pal » Best bang for the $$ mod on these S54 motors IMHO ... love it Agreed - your mod is about the only engine mod I've considered for my Z4MC.
These pretzels are making me thirsty!
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