what size round drill bit to drill stock air box?

[azcummins]

I'm looking to drill holes in my stock airbox and was wondering what size round bit (ones used for drill holes for door knobs) I should used.

Has anyone done this and how did it turn out?

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Mark Callahan

1998. 5 3500 4x4 24V 5spd, Geno's Muffler Kit, Chrome exhaust, Western Hauler Headache Rack, Chrome Rocker Panels, A-Pillar Mounted Boost and Oil Temp Gauges, No Turbo Silencer Ring (Yeah Baby!)

 

[Old Account - 243]

Mark,

When TXRam added the PE, the filter minder would get pulled down about 2/3 the way. Even without the filter, it would pull it down halfway. He pulled the snorkle that connects to the fender and told me that that was the restriction.

I did the same and have seen no ill effects.

243

 

[Joseph Donnelly]

I agree. Cutting holes in the airbox runs the risk of cracking the plastic, the hottest underhood air gets in, along with dirt, rocks, small birds, etc. #ad

Just remove the collar to the fender, take two aspirin, and relax. #ad
I run the stock airbox without collar, and stock air filter. I haven't yet been able to pick up even one hp on the dyno by propping the airbox open for a run. #ad

 

[Waterpete]

Piers pulled out my air horn and it really did help but the extra noise was so bad that my wife and the neighbors made me put it back in.

 

[Waterpete]

Originally posted by waterpete:
Piers pulled out my air horn and it really did help but the extra noise was so bad that my wife and the neighbors made me put it back in.

My remedy for this is to just turn my PM -3 down a few a clicks, unless I pull up next to a ford, of course!

 

[JR2]

I pulled the horn out and saw no ill efects. . so then I pulled the entire airbox out and put a KNRE0880 on the end of the hose..... WOW now the truck is loud and the boost seems to come up faster... I put the silencer ring back in and it quieted down a bit... still louder than stock. . but not too loud.

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John D. Rathert Jr.
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01 2500 Forrest Green Sport SLT+ QC LWB 4x4 Auto 3. 54 rear end with all options avail. DC Nerf Bars, DC Grill Gard, DC mud flaps, Line-X bed liner, Leer 160XL Topper, Power Edge, EZ Edge, SPA Boost/EGT Gauge on pillar mount, DDT's tc/vb combo, 275 RV injectors, DD 4" Exhaust and a KN RE0880 where the air box use to be. New turbo (HX40), SS fuel lines and bigger injectors in planning stages... . See My Truck, Dads truck: 98. 5 3500 SLT QC LWB 4x4, Brother Truck: 92 W250 SLT CC LWB 4x4 (Dads old truck) Winter fun - 2000 Skidoo Summit 700
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[jkern]

i pulled the air horn out, and drilled two 2. 5" holes, one in the front and one in the back of the box, i have not noticed any more noise than stock, nor have i seen any difference in EGT's. but i am more confidant that the engine gets all the air it needs, especially when the boost hits 40psi. i am running a stock replacement paper type air filter. my filter minder never moved with the stock set-up, and i really don't expect it to now either.

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Jeremy Kern
1999 2500HD 4x4 QC,SB, ISB, 5spd, 3. 54LSD, 33x12. 50 cooper STT's Denver off-road bumper with Ramsey RE12k, PIAA series 520 lights, Rancho RS9000's, heavy ft. springs, JVD Torque Enhancer, DiPricol boost and pyro gauges, and a bunch of other little things! www.geocities.com/phrn30 for pics!