Is it better to use the coat hangar, or drill holes?

What was the optimal size, number, and location of holes to drill in the stock airbox?

I know this was discussed but I can't seem to find the thread. If somebody could point me to the best GAB setup that'd be awesome.

 

I installed an AEM dryflow filter. There is a noticeable difference above 3k rpm.

I'm still wondering if drilling the 4 holes or chopping out the entire top of the filter panel would result in better performance?

4 holes vs. coat hanger?

 

please search, optimal is 3 - 1" holes if i am not mistaken

 

seven 1" holes, iirc

 

theres a thread we are both trying to remember, a guy did a lot of testing to find out.

 

I never found the thread with dyno results, but I've read several threads which reference the dyno tested GAB thread.

It seems 4 1" holes on top of the filter holder were optimal and netted 9whp!? That seems like a lot.

I'm already impressed with the results from adding an AEM dryflow filter, it pulls a little harder up top (I advanced the timing 2 degrees but this was before the addition of the AEM filter). Now I'm debating if I want to drill the holes. I'm not sure I want to risk losing some low end, that's where I do most of my driving.

Thoughts on loss of low end with GAB?

 

That's what I did too.

 

I did 6-1" holes on top and 3-2" ones on the front/battery side-didn't noticed anything at lower Rpms but mid to high she was pulling harder(even on a 101f day lol) oh and I have a drop in K&N. I did the test with K&N in it without the holes then with the holes(same day,same temps)

 

I love my low end so my airbox will remain unmodded for now, even with cold air intakes you lose a little down low torque.

 

An actual cold air would have long piping, so you would not lose any low end (if there's not a hole into the fender, then it's not a cai :P).

 

I lost a notable amount of torque in my 98 dodge avenger (4 cylinder) but my 01 Acura Cl (6 cylinder) loved the extra breathing and didn't realy feel a loss, both mounted in the fender well area. Hell the internet isn't no help because there's so much conflicting info about cai's and power loss/ gain.

 

Just for the improvement in sound its worth it.