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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 03-20-2012, 12:50 PM   #341
flipm3
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You should make an XPipe right after the Section 1, then have the exhaust exit on both sides of the car!!! That would be so sick!!!

That way, you can still use your Burns 2.5" X Pipe. Maybe trim it to make it fit, then make the dual piping out both the driver and passenger side. That may even make more room to fit bigger resonators to quiet things down.
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Old 03-20-2012, 12:57 PM   #342
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Quote:
Originally Posted by flipm3 View Post
You should make an XPipe right after the Section 1, then have the exhaust exit on both sides of the car!!! That would be so sick!!!

That way, you can still use your Burns 2.5" X Pipe. Maybe trim it to make it fit, then make the dual piping out both the driver and passenger side. That may even make more room to fit bigger resonators to quiet things down.
That's a hell of an idea... never really crossed my mind, haha. What turned me onto the side exit was the GTR and VAC car I saw... they look badass!

Exiting on both sides would be interesting... definitely would make it easier to control heat and probably sound.
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Old 03-20-2012, 01:02 PM   #343
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I actually meant for it to exit the passenger side... whoops. Like this (in grey):


Just not crappy paint bends like that... more like the other pic.
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Old 03-20-2012, 01:02 PM   #344
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Quote:
Originally Posted by Tarmac_E46_M3 View Post
That's a hell of an idea... never really crossed my mind, haha. What turned me onto the side exit was the GTR and VAC car I saw... they look badass!

Exiting on both sides would be interesting... definitely would make it easier to control heat and probably sound.
DOOOOOOOO ITTT!!!!!!!!!!
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Old 03-20-2012, 01:17 PM   #345
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Old 03-20-2012, 01:29 PM   #346
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If you're curious, here's a photo of the exhaust on the 2008 Z4 GTR.

Notice how they use an XPipe/Resonator close to the engine, then use a dual exhaust for the remainder.
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Old 03-20-2012, 01:45 PM   #347
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That probably works like the bw race exhaust, ypipe (xpipe same,thing) close to the engine maximizes peak hp, bit loses low end. Thats why im trying to make the coupe after the section 1, or around that area. That way I can maintain good low to mid range power.
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Old 03-20-2012, 01:51 PM   #348
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Quote:
Originally Posted by Tarmac_E46_M3 View Post
That probably works like the bw race exhaust, ypipe (xpipe same,thing) close to the engine maximizes peak hp, bit loses low end. Thats why im trying to make the coupe after the section 1, or around that area. That way I can maintain good low to mid range power.
Yeah! I definitely agree.

So I think your though process behind the exhaust sounds pretty cool and spot on! It would be pretty interesting to see if you can fit the exhaust without jeopardizing too much road clearance.

The best part about running an exhaust like this is, if you ever turn the car into a full out track car, you can build a much more proper rear diffuser.
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Old 03-20-2012, 01:56 PM   #349
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Yeah! I definitely agree.

So I think your though process behind the exhaust sounds pretty cool and spot on! It would be pretty interesting to see if you can fit the exhaust without jeopardizing too much road clearance.

The best part about running an exhaust like this is, if you ever turn the car into a full out track car, you can build a much more proper rear diffuser.
I hope I'm on the correct route. I won't be steered in the wrong direction when i go to the custom exhaust shop... I think more than anything, i worried of what its going to cost!

I might sell my ss v1 section 1 and just get a custom one made for my system.
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Old 03-20-2012, 02:04 PM   #350
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Quote:
Originally Posted by Tarmac_E46_M3 View Post
I hope I'm on the correct route. I won't be steered in the wrong direction when i go to the custom exhaust shop... I think more than anything, i worried of what its going to cost!

I might sell my ss v1 section 1 and just get a custom one made for my system.
A custom set of headers will be INCREDIBLY expensive if done properly. Making headers is really a black art and requires a lot of trial and error.

Honestly, nothing really gets much better than what Supersprint has already done and hopefully Epic and Evolve as well. I highly doubt you could gain much more. So instead of making it more complicated, I would personally stick with what's already proven.

Many years ago, Supersprint made a custom one-off header maximized for one of their racing clients. The headers were seriously a work of art, but INSANELY expensive. I think it required a bit of modification to make them fit as well.

I have a pic somewhere, I'll see if I can dig it up for you.
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Old 03-20-2012, 02:29 PM   #351
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I was talking about a custom section 1 that matches the v1 headers, not headers.
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Old 03-21-2012, 12:55 AM   #352
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Check this exhaust out:


It is an E92 M3, so a bit different.. lol. But the idea is kinda like what Flipm3 was saying.
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Old 03-21-2012, 11:17 PM   #353
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Check this exhaust out:


It is an E92 M3, so a bit different.. lol. But the idea is kinda like what Flipm3 was saying.
Do it!
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Old 03-21-2012, 11:41 PM   #354
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I need to save up first! But I still need to....

1) get coilovers
2) send my headers to get coated
3) Make a custom intake/get a new tune
4) Remove EVAP
5) SELL a TON of parts

After all that, I'll go for it. Selling all the extra parts I have will probably pay for the custom exhaust... haha.
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Old 03-22-2012, 12:12 AM   #355
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You going to bimmerfest bro?
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Old 03-22-2012, 12:25 AM   #356
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Probably not. When is it?

Sent from my ADR6400L using Bimmer App
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Old 03-22-2012, 12:26 AM   #357
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Like may something. Im not sure. Just go. I wanna see this car.
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Old 03-22-2012, 01:00 AM   #358
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Like may something. Im not sure. Just go. I wanna see this car.
It's not that easy... I have a crazy schedule.
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Old 04-02-2012, 04:52 PM   #359
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Well, got the car back. Now has the VAC rear subframe reinforcements, solid diff bushings, powerflex poly subframe bushing and... BMW Motorsports 4.10 ring and pinion. car feels great! A bit more noise due to the aluminum diff bushings, but shifts feel super crisp, I love it!

Just purchased a used set of Intrax Coilovers, which have true rear coilovers. Those should be here by the end of the week, probably won't be installed till sometime next month. Along with that I'd like to do a full rear strut tower reinforcement with braces tot he "upper' subframe area and all that jazz. basically... in about 2 months, my suspension will be ready for anything! Should drop a bit of weight, but not expecting to save much, since the bars to make the strut tower/subframe reinforcement part will definitely add weight. Good weight though, as it will make the rear stiff as a brick!

I think I mentioned that I coated the rear seat/trunk panel with the rubber spray stuff; helps a bit with sound, definitely a plus with the diff being a bit louder now. I'll think I'll be coating everything in the rear, including the trunk area, to help with sound adsorption a bit. My guess is that will probably add about 10 lbs, total, but well worth it.

I should be sitting around 3000 lbs. Remove the EVAP, coilovers, ebrake cables should drop around 40 lbs; guessing anyways. So that should put me some where around 2960 lbs, add 20 lbs for the reinforcements and 10 lbs for all that rubber should put me back in the 2990 lb area. Not where I want to be, weight wise... but it should handle like a champ after that and the performance gain will definitely outweigh the "added" weight back onto the car.

Once I stop being lazy, I'm going to manage all the wires the best I can. Basically keep what I need and take all the wires that go to nothing (since I've deleted a lot of stuff). I'm hoping for around 10 lbs with that, maybe more. I will also be doing a brake booster delete (not soon, eventually). That will drop another 10 lbs or so with that. Before I do either of those, i want to get my headers coated and installed, then tuned. Headers obviously add power, but should drop 10 lbs from what I've read. All together it should be around 30 lbs off the car, putting around 2960 lbs.

I'm going to be slowing down now... at least after the coilover and strut tower/subframe stuff. Other than headers, since I already own them, I'll definitely be taking a break till at least the end of the year. As far as expensive stuff goes. So most of my mods, will be cheap or free and will most likely only be weight related.
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Old 04-02-2012, 05:01 PM   #360
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I sure hope you're a skinny guy. Often the best weight loss mod is a diet.
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