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Old 04-10-2003, 10:06 AM   #1
325iBiMMeR
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Back Dash

Hey guys I have a 325i with no ski pass or fold down seats so it really sucks I can't seem to get sound into the cabin so I have decided to cut some holes in the back dash just like to port the subs in the trunk. Thinking about cutting 2 5/6 inch wholes in the back dash. A couple of things I really need to know.


1. How do you take apart the back dash just the top carpeting inside the cabin .

2. What kind of tool should I use to cut these wholes. I was thinkin about a Jig Saw any other suggestions.

3. Do you guys think it will actually make a big difference in sound?

Thx for your help.
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Old 04-10-2003, 10:58 AM   #2
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I wouldn't recommend cutting holes in the dash. If you want to get more sound into the cabin, remove the rear speakers.
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Old 04-10-2003, 11:05 AM   #3
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Well I did think about removing the rear speakers but I really want to keep them so it would sound better. If i were to cut straight throught I would put speaker covers over the whole. Or I wouldn't cut throught all the way and just leave the top cover on unless it rattles. I really want to keep the rear speakers thats why I wanted to cut some holes
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Old 04-10-2003, 11:21 AM   #4
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Get the plate behind the arm rest cut out. It'll be just like you have the ski pass through and you'll get plenty of sound especially when the arm rest is down.
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Old 04-10-2003, 05:22 PM   #5
325iBiMMeR
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Well the thing is that I don't have an arm rest. It doesn't go down it just the whole back seat thats why I just want to cut 2 holes in the back dash.
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Old 04-10-2003, 05:27 PM   #6
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You could chop a couple of nice round holes and get some grills to put over them so they don't look bad I wouldn't think that a 5/6 inchhole would do much for you. I'd go more like 3 inch
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Old 04-10-2003, 11:14 PM   #7
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325iBiMMeR, I'm confused, did your car come with HK or not? If it didn't, doesn't the non-HK come with two speakers mounted in the rear deck (most call it a rear deck vs. a back dash)?

If the speakers in your rear deck are the HK subs, there's no reason to keep them, i.e., the bass wasn't enough for you, so you got the new subs. All the factory subs are doing is muffling the sound of the equipment you just spent money on.

If the speakers in the rear deck are the 6" woofer/midranges, you can also take them out, as they're not important enough to imaging to justify leaving them in and again muffling the new subs.

If you still want to cut holes in the rear deck, you have your work cut out for you. The instructions are on a BMW TIS disc, but I'll give you high-level view of how much needs to be done:

1) you have to remove the trim around where the seat belts enter the rear deck

2) you have to remove the at least the vertical portion of the rear seat

3) you have to remove the trim pieces between the rear deck and the rear window

4) after you pull out all those piece, there's some rivets on the front (behind where the seat used to be) and some screws in the trunk (think from under the deck) that need to be removed.

After all that's done, you should be able to pull the rear deck vertically, and have access to the metal plate that makes up the trunk internal "roof"

Good luck...
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Old 04-11-2003, 03:27 AM   #8
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If the car didn't ship with the HK system, then the two holes which the HK subs fire through are pre punched in the rear deck sheet steel.

From the trunk, look under the rear deck, towards the centre, there should be two circles which are pre stamped. Just a simple tap with a mallet and they can be knocked out, leaving two holes thorugh the deck which currently are unsed.

This is all assuming of course that you don't have the HK system - if you do, then as Johnhab has suggested, just remove the HK subs and eiother fabricate a baffle for some IB loaded drivers or that alone, will allow more air flow from trunk to interior. You could always go for a ported enclosure and vent the box with a JL flew port through one of the pre provided rear deck cutouts.....
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Old 04-11-2003, 10:07 AM   #9
325iBiMMeR
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Sorry for the confusion you guys. Yeah I don't have the HK system with my car. Taking apart the back dash seems pretty hard.

So I can just punch out those to pre cut hole in the trunk roof where the HK system is suppose to be? I'll go take a look at my car later today to see if it has it. So I would just punch those to holes out and remove the insulation between the the rear deck and metal sheet? Will It rattle?
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Mods:
19x8.5 ADR M-Sports Hyper Black
M-Tech Front
M-Tech Rear
Painted moldings
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Gruppe M
UUC Twin Silencer Exhaust
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Interior:
2 10inch Alpine Type R
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Old 04-12-2003, 10:05 PM   #10
325iBiMMeR
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There are no holes in the back trunk where the HK system is suppose to be. Nothing is the same on the top trunk roof. There are bumps and crap all over the place so I have no clue where to cut. What do you guys think?
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2002 325i

Mods:
19x8.5 ADR M-Sports Hyper Black
M-Tech Front
M-Tech Rear
Painted moldings
Painted Grill
Gruppe M
UUC Twin Silencer Exhaust
Euro Clears
Silver Visions

Interior:
2 10inch Alpine Type R
Hard Wired V1
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