M54 Madness, the remix

[TheAxiom]

I'd venture to say that the experience will be the same. eBay headers are typically similar to, if not directly copying, the Racelands. Thin-wall tube that tends to be noisy as hell - that was my experience too, and my S50 turned out still pretty dang loud after adding an x-pipe, dual cats, dual resonators, and then changing to the claimed quietest-aftermarket Dinan muffler.

I made good power with mine and I don't remember them being that much louder than stock (on stock exhaust)

[butters]

Why not ebay headers?

I'd venture to say that the experience will be the same. eBay headers are typically similar to, if not directly copying, the Racelands. Thin-wall tube that tends to be noisy as hell - that was my experience too, and my S50 turned out still pretty dang loud after adding an x-pipe, dual cats, dual resonators, and then changing to the claimed quietest-aftermarket Dinan muffler.

[digger]

and what happened to the euros?

[TheAxiom]

Problem is, it's louder everywhere. It feels like the gauge on the headers is thinner and they just make a lot of noise.

Once Tyler gets his shop back online I'll have him fit my OBD2 headers and down pipes. It's a little bit of a step back but I know they'll be civilized and that's what I'm after now.

Why not ebay headers?

[hoveringuy]

Problem is, it's louder everywhere. It feels like the gauge on the headers is thinner and they just make a lot of noise.

Once Tyler gets his shop back online I'll have him fit my OBD2 headers and down pipes. It's a little bit of a step back but I know they'll be civilized and that's what I'm after now.

[ForcedFirebird]

for reduced noise just add a muffler or resonator (or additional ones) with longer length and fatter body (more volume)

I find that changes note more than anything. Best thing to do is add a j-pipe (Helmholtz chamber) to cancel that noise, leave the rest of the exhaust alone. Drive around and see what RPM the drone is worst, do a little math, and a tee with a curved pipe can be done at your local exhaust shop if you don't have access to a welder. This won't change the sound much from outside the car, but cabin frequencies will be cancelled.

[digger]

for reduced noise just add a muffler or resonator (or additional ones) with longer length and fatter body (more volume)

[ForcedFirebird]

As far as the injectors, I ended-up using a dremel to cut a groove in the appropriate place and it seems to be holding fine (although it still makes me a little nervous...).

Don't be. I have been doing this for years on turbo m20 builds. I use a fence in the band saw to make the grooves all the same height. There's a metal tube inside, where the filters are inserted, so cutting the plastic is non structural.

[mike25]

I've got it together enough that I drove on an errand into Seattle.

It's lost some low-end grunt, but pulls like a raped-ape higher. Idle is incredibly smooth. No oil leaks. Zero (so far).

My one big complaint is that it's WAY louder than before. I don't know if it's the Schrick cams or the Raceland headers, but the cabin drones bad. I may switch back to OBD2 headers. I was always happy with those.

Steve
Have you read this article? :http://www.unofficialbmw.com/images/e46m3exhaust.pdf

- it suggests resonance is a function of tail pipe length compared to the muffler box length. You could experiment with sleeves on your tail pipe to see if it improves the resonance?

Mike

[TheAxiom]

As far as the injectors, I ended-up using a dremel to cut a groove in the appropriate place and it seems to be holding fine (although it still makes me a little nervous...).

I was hoping that my update would be a dyno plot; I've been daily driving it for the last week after making it to the Picnic. I'm trying to do a group dyno on the 16th.

Impression so far is that it pulls hard.

I also miss the S50b32 headers. Tyler did an amazing job getting Racelands to fit like a glove, but they're loud and droney. I have OBD2 headers and mids to make it more civilized.

I doubt they make any more power than your Euro headers. The collector location just kills the low/mid range power.

[hoveringuy]

As far as the injectors, I ended-up using a dremel to cut a groove in the appropriate place and it seems to be holding fine (although it still makes me a little nervous...).

I was hoping that my update would be a dyno plot; I've been daily driving it for the last week after making it to the Picnic. I'm trying to do a group dyno on the 16th.

Impression so far is that it pulls hard.

I also miss the S50b32 headers. Tyler did an amazing job getting Racelands to fit like a glove, but they're loud and droney. I have OBD2 headers and mids to make it more civilized.

[TheAxiom]

Bump?

[Sh3rpak!ng]

Did you figure out the injector spacers? Out of curiosity I googled it and it seems like someguy just 3d printed what is readily available to solve what seems like a pretty common issue.

Also thanks for the euro headers :D they should be arriving today and I am extremely excited. Been trying to get my hands on a set for years but couldn't justify paying more for shipping overseas than for the headers themselves

[hoveringuy]

I've got it together enough that I drove on an errand into Seattle.

It's lost some low-end grunt, but pulls like a raped-ape higher. Idle is incredibly smooth. No oil leaks. Zero (so far).

My one big complaint is that it's WAY louder than before. I don't know if it's the Schrick cams or the Raceland headers, but the cabin drones bad. I may switch back to OBD2 headers. I was always happy with those.

[hoveringuy]

I characterized the flow on my -715 24# injectors and got some nice data. Nicely linear.