Dell
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Registered: 20th Feb 03
User status: Offline
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Thats my airbox drilled and back in place! So good.
Ive drilled about 15 smallish holes, cleaned it out aswel cos it was a bit manky. Dryed with a hair dryer (you can dry anything with them things ... such a tool!) 
I get such an awsome sound from it now..so low and heartly.
Such a small mod I know but its my first, and so satisfying!
Thanks for all the advise.
P.S. What difference will the aftermarket filter make? Will it sound even better?
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antscorsa
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Registered: 11th Aug 02
Location: london
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is it nosy at low revs or throughout rev range. an u send me a pic or diagram of where ur drawed holes
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Karnage Corsa
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Registered: 4th Nov 02
Location: Norton, Stockton-on-Tees
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quite interested in that too mate if you could post a pic I am taking out me induction kit tomorrow and doing exactly as you have done
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Danny P
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Registered: 20th Nov 02
Location: Cleckheaton, West Yorkshire
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Was thinking of doing the same, but ant got a clue where to start. Pics would be very helpfull
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Karnage Corsa
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Registered: 4th Nov 02
Location: Norton, Stockton-on-Tees
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is it the actual black air box the outer casing that you drill if so its got to be a piece of piss
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dig dave2811
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Registered: 6th Jan 03
Location: newport sout wales WCM
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dont drill the side facing the engin though
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Karnage Corsa
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Registered: 4th Nov 02
Location: Norton, Stockton-on-Tees
User status: Offline
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SO JUST DRILL THE TOP THEN YESAND LEFT HAND SIDE AS YOU LOOK AT IT ON OTHER SIDE OF THE ENGINE ?
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dig dave2811
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Registered: 6th Jan 03
Location: newport sout wales WCM
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yup left hand side and its the bottom of the air box u drill not the top.
drill as many holes as possably without causing the structure of the air box to become really flexable etc
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Dell
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Registered: 20th Feb 03
User status: Offline
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Yeah dont drill the top cos that would bypass the filter (youll see when you take the lid off)
I put about six on the left hand side, 2 on the bottom very close to the left, and 3 on the left corner (its a sloped corner).
It seems deep through the rev range. Not been able to test that properly though as my car limited to about 4 thousand revs at the mo 
Yeah it is the black outer box u drill, It took me about 20 mins altogether but that included giving it a good clean.
I'll try and gets some pics on here 2morow.
Hoping the new filter makes it louder as its a lot louder with the bonnet up - obviously.
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Karnage Corsa
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Registered: 4th Nov 02
Location: Norton, Stockton-on-Tees
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look forward to seeing that then probably do mine over the weekend what filter have u bought mate ?
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Makarus
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Registered: 25th Jun 02
Location: Nottingham/Derbyshire Boarder.
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I am having to do it soon, not happy to do it but insurance has just stung me and want the sound without the increased premiums.
Dunno if there is any difference with a K&N panel filter or something.
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Dell
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Registered: 20th Feb 03
User status: Offline
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Havent bought one yet..should get it 2morow, looking at maybe a K&N? Anyone suggest a better panel filter?
My Girlfriends just text me to say she could here it when I pulled away from her house, glad to know people outside can here it
It may be in my head but I have to say it does seem to have more breath when pulling away now.
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antscorsa
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Registered: 11th Aug 02
Location: london
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cool mate defo get sum pics up or su drawings at lea
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sxi_welshy_boy
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Registered: 16th Sep 02
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Surely a proper induction kit has got to be better than a few holes?? IMO
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Makarus
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Registered: 25th Jun 02
Location: Nottingham/Derbyshire Boarder.
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For performance yes, but getting the sound without the extra insurance premium is a very good lure.
I am getting rid of my K&N 57i because it cost £350 to cover an induction kit and nothing to cover a drilled air box.
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luca2020
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Registered: 26th May 02
Location: Maidstone, Kent
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sxi_welshy_boy = on any other car yes, on a corsa no, it will be detremental to ur cars performance
why, because with the induction kit u have no heat shielding from the engine, so ur sucking in hot air, with a drilled box u get good air flow, sound whilst the air still being relativly cold compared with an induction kit
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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And insurance man wont rape your arse for it either. Get a K&N panel filter as these flow more air than OE GM stuff.
Dave
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StuartGee
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Registered: 10th Dec 02
Location: Ellon, Aberdeenshire
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I have already done this, as advised by TotalVauxhall:
In the bottom left corner (nearest headlight and wing) make a large hole, about 50-60mm diameter. From this, run a piece of pipe to anywhere, preferably just below the headlight. This is because there is either a low or high pressure (can't remember which) area about here, so you will get more cold air being sucked into the box.
Hope it all works out good. And K&N is a good choice!
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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yeah its because cold air comes thru the headlight housing
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Brett
Premium Member
Registered: 16th Dec 02
Location: Manchester
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can anyone post any pics of a drilled airbox?
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Ajones_17
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Registered: 20th Jun 02
Location: Sunny Wigan Drives: BLACK 03 VTS
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so is it best to just drill 1 large hole or is it better with several small ones. pics would be great aswell.
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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A large hole will give a deep resonating sound when accelerating. Lots of small holes will create a raspy, LOUD sound.
Dave
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Ajones_17
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Registered: 20th Jun 02
Location: Sunny Wigan Drives: BLACK 03 VTS
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i've got a custom built jap style 5 inch slash cut backbox so i wanna make that a bit louder if possible but i also want it deep. which one would be best.
Andy
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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couple of Large holes
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Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
User status: Offline
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Cut the whole front panel of the box then
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