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E34 (1989 - 1995)

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  #1  
Old 10-14-2012, 12:37 PM
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Costa Costa is offline
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Straight piping Q's

My exhaust system has succumb to rust over the years and it has finally cracked in some areas. I really want to straight pipe my 540 because it will sound awesome. I will keep the cats, but they'll be hollowed out.

Will I have to baffle parts of the piping so I can get the same amount of back pressure? I'm thinking of going from headers back.
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  #2  
Old 10-15-2012, 04:21 AM
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Quote:
Originally Posted by Costa
I really want to straight pipe my 540 because it will sound awesome. I will keep the cats, but they'll be hollowed out.
I think that may be a bit louder than you're prepared for. A straight piped Bavarian 4 liter is beyond loud when under load...from inside the car it will make you deaf, even with ear plugs. Cool for about 15 minutes. A resonator at the bare minimum, and even then.
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  #3  
Old 10-15-2012, 04:52 AM
snowsled7 snowsled7 is offline
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I straight piped the rear muffler section, left the cats and resonator stock. It is loud, way too loud for most. In town where there are lots of buildings to reflect the sound, it is obnoxious. Out here in the wild and wooley west though, I really like it.

Obviously the V8 is going to have a more mellow tone but, I agree, that will most likely be way more free flowing than you had hoped. When you redesign the system, just leave yourself a place to cut in a muffler should you change your mind.

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  #4  
Old 10-15-2012, 07:17 AM
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Quote:
Originally Posted by snowsled7
Obviously the V8 is going to have a more mellow tone but, I agree, that will most likely be way more free flowing than you had hoped.
Think even louder....and very obnoxious. The M60 has a lot more bite to its exhaust note than the M30. Straight piping from the manifold back combined with the M60's higher compression ratio yields a terribly raucous noise.

Even with a simple resonator, they are flat-out deafening. I've witnessed these beasts several times at the track during car club events. The engine sound in the video below is quite similar to what I'm trying to describe, except try to think of that with the engine under a constant load, instead of a 20 second parking lot parlor trick. Not saying the OP shouldn't do it...just that he might get a little more sound than he was asking for by gutting the cats and providing a clean shot downstream. IMHO, it's a good sound at the track or a hill climb, but not for for running errands around town or highway commutes.

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Last edited by Radian; 10-15-2012 at 07:34 AM.
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  #5  
Old 10-16-2012, 12:37 AM
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M540FELLA M540FELLA is offline
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Not to mention that some towns have a sound ordnances and you could get a ticket. I'd check your local laws first. Why not get a magnaflow muffler?
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  #6  
Old 10-16-2012, 12:47 AM
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Hmm, I might just straight pipe from the manifolds back but put a magnaflow or dinanize my factory muffler. By Dinan-ize I mean cut open the muffler and gut it. That's basically what Dinan did, and they charged anywhere north of $1k for it. While I'm at it, I want to get bigger exit pipes so it looks better than the 2-1/4 inch pipes coming out right now. I'm planning on getting my car off the road in december and doing quite a lot of work to it, right now I'm gathering resources and tools to help me do so. Hopefully next year this time, I'll have a S62, 6spd, and a 3.15LSD lined up and ready to go in. It's quite optimistic but I see no point of trying to scrounge power out of my M60 without going with forced induction, I'll also spend more money trying to get 400hp out of it.
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  #7  
Old 10-16-2012, 01:03 AM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
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on a road car you NEED a muffler. resonators and straight pipes will not cut it. This is my M52B28 E30 i built before i got into E34s. Im running two Coby resonators followed by the a glass pack. not sure if the video will give the desired effect, but it was REALLY loud on anything other than idle. sounded t1ts, but no good for a daily.

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Last edited by _Ethrty-Andy_; 10-16-2012 at 01:05 AM.
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  #8  
Old 10-16-2012, 02:11 AM
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M540FELLA M540FELLA is offline
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Since your just gonna swap motors, I'd just keep the rusty one or straight pipe it. Hope you got about 10k for all the work your gonna have to do to swap in a s62/6. However it will be a sweet ride once done.
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  #9  
Old 10-18-2012, 04:05 PM
bE34ST bE34ST is offline
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I was thinking about straight piping my car a mont or so ago. When I was swapping out my CSB I drove it down Hwy 99 with no exhaust, holy effing balls it was loud. Definately not okay. I do want to try some combination of resonators and maybe a different muffler for a more aggresive sound without being obnoxious.

I love the sound of the M60, let it be loud and proud.
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Last edited by bE34ST; 10-18-2012 at 04:07 PM.
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  #10  
Old 10-18-2012, 04:44 PM
Josh429er Josh429er is offline
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I say do it. I love loud Haha. I drove a pretty straight piped 525 and I really really liked it. These cars have a lot of sound deadening. I drove a 1.6l 4 cycle with 1 inch straight pipe. It was gutted too. No one liked it but me. Point is that It's personal opinion. It will be loud as all get out under load. And i bet you wouldn't get it up to redline twice lol. My advice is go 3inch back. Resonater. Headers and untouched cats.
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  #11  
Old 10-18-2012, 07:21 PM
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Lol my friends have convinced me otherwise.. Straight piping, and living in a residential area don't mix. I've decided to gut the cats, the muffler and remove the centre resonator. It should give me the loudness I want, and also keep it within acceptable boundaries.

@josh, I'm gonna need around 7k to source all the important parts - engine, trans, LSD and maybe a couple 100 for the other stuff. It will be installed by a crack team of mechanics (me, and a couple of friends with very little mechanical experience) we will take our time to do it because rushing such a project like this will just end in failure. If I haven't specified it already, I'm using this year to get my chassis ready for all that extra power, I'm installing a lot of new suspension bits this winter, along with 840Ci 4pots in the front and M5 rear calipers that are going to be installed whenever I get the resources to do so. I know this sounds crazy and VERY optimistic of me but I'm fully behind my idea, I have a great paying job that can fund it, and because of my job, 3 day weekends to do it. Hopefully I can get my build thread started in December when I take my car off the road for the small winter we have up here in the pnw.
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  #12  
Old 10-18-2012, 07:55 PM
Josh429er Josh429er is offline
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Well the best of luck. Can't wait to see the build thread.
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  #13  
Old 10-18-2012, 07:56 PM
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Lol neither can I
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  #14  
Old 10-19-2012, 04:51 AM
snowsled7 snowsled7 is offline
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Quote:
Originally Posted by M540FELLA View Post
Not to mention that some towns have a sound ordnances and you could get a ticket. I'd check your local laws first. Why not get a magnaflow muffler?
With all the stright piped hardly davidsons that roll through here rattling windows, I would love to see them try and justify a ticket for my loud car.

But yes, probably too loud for in town.
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