There are several different options for a good air filter. I use K&N always. I used to offer a kit that had an AFM adapter with a 3" RC-4180 filter. I don't offer any products any more, but similar AFM adapters are widely available.
JBLMk3 filter kit with K&N RC-4180 filter
The commonly available kit by K&N comes complete with a larger AFM adapter and filter. This is the best option for most cars and is what I used for years.
K&N installed on my 87
If you really want the biggest filter you can get in your Supra, then this option is the one you want. This is what was in my 91 and is now in my 7M-GTE Celica. You can use the same adapter that K&N offers for the supra in their kit but instead of using the smaller filter they give, I used the very large RF-1020. This is the biggest cone filter that K&N makes.
K&N RF-1020. Click picture for details on K&N's site.
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