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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-08-2014, 11:32 PM   #1
Patarrick
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Question How do I eliminate rasp? 2000 328i

Hi guys

Does anyone know how I can eliminate as much rasp as possible?
I've searched around on to find couldn't find anything specific to what I was looking for exactly.

I have Dinan muffler (came with the car when I bought it).
I recently removed the stock headers and put on some ebay headers (I don't need/want the cats since I don't need to pass any state inspection so there's no need to lose any gains).
All the middle stuff between the two is stock.

The headers made my exhaust 100% louder but also came with 100% more rasp.
Once I hit about 3000 rpm, the rasp is all I can hear and it's unbearable and embarrassing.

I've read a lot of people saying an x-pipe will do it and others say it won't do anything. I've read a lot about a rasp pipe but I've only found one of those for the M3. There is also a lot about a resonator delete or muffler delete so I'm not even sure what would be the right approach here. I would rather like to know how I should move forward before I start chopping & welding stuff up.

I have my own tig welder so I am not afraid of having to modify specific sections of the exhaust. I do not want to buy a different brand muffler, exhaust, or such. I just want to minimize the rasp with the exhaust set-up I have currently.


Thank you

Last edited by Patarrick; 08-10-2014 at 03:26 PM.
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Old 08-09-2014, 01:32 AM   #2
HakenTT
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Catalytic converter will delete the rasp. It worked for me.
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Old 08-09-2014, 11:40 PM   #3
Patarrick
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I don't want to reinstall the stock headers. I like the +15 hp more than I hate the noise.

Is there a way to get rid just by modifying parts of the cat-back exhaust?
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Old 08-09-2014, 11:50 PM   #4
Rob43
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Post up a picture or diagram of your exhaust, I need to know what I'm working with.



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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
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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 08-10-2014, 02:38 AM   #5
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I got a resonator delete for more rasp so probably dont do that

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Old 08-10-2014, 02:35 PM   #6
Patarrick
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Looking further into my own exhaust, I discovered Dinan doesn't do cat-back but only the muffelr. So the muffler is Dinan, while the other sections are stock.

I never paid much attention to it and just took the guy's word for it when he sold me it.


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Old 08-11-2014, 12:52 AM   #7
Rob43
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OK I'm clear now, here's exactly how I'd proceed. I would buy one (1) Car Chemistry Three (3) disc insert, you'll need to take a measurement of your inside tube diameter to make sure you buy the right one. This should take away some or all of your rasp*, it's cheap & easy to install, plus it wouldn't take away from your HP. Summit Racing & Jegs should have these in stock, check around for best price.

http://www.carchemistry.com/3-disk-i...-1-2-diameter/


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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 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!!

Last edited by Rob43; 08-11-2014 at 01:27 AM.
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Old 08-11-2014, 08:08 AM   #8
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Quote:
Originally Posted by Patarrick View Post
I don't want to reinstall the stock headers. I like the +15 hp more than I hate the noise.

Is there a way to get rid just by modifying parts of the cat-back exhaust?
15hp sounds optimistic- Care to share the dyno with us?
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Old 08-11-2014, 10:04 AM   #9
Patarrick
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15hp sounds optimistic- Care to share the dyno with us?
Its probably more like 5-10 but I like to believe my butt-dyno tells me it's more
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Old 08-11-2014, 06:31 PM   #10
Patarrick
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Quote:
Originally Posted by Rob43 View Post
OK I'm clear now, here's exactly how I'd proceed. I would buy one (1) Car Chemistry Three (3) disc insert, you'll need to take a measurement of your inside tube diameter to make sure you buy the right one. This should take away some or all of your rasp*, it's cheap & easy to install, plus it wouldn't take away from your HP. Summit Racing & Jegs should have these in stock, check around for best price.

http://www.carchemistry.com/3-disk-i...-1-2-diameter/


Good luck,
Rob43







* Use both silver end caps that are provided.

I'll definitely look into that! I'll post results whenever I can get around to it.
Thank you!
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