Another Oregonian
. Seems like us Oregonians are coming out of the woodwork this past year or so
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Yes the biggest thing you can do to an IDI is buy a turbo. The new ones are nice to have, because you know they come with everything and they should last for a long time, but they are quite spendy. I hear banks actually discontinued there turbo lineup for the IDI, and I also hear some people say that ATS is no longer making/selling kits, but I think they still are. A used kit will run you around $1000+- a couple hundred depending on condition. I'm sure someone on here has one for sale. You can also look on ebay for a kit, along with craigslist.
And you have the right idea, before you do any mods, put a pyro on. If you cant get a turbo, you can always rig up an intake, theres different styles you could choose to use, and then put on a freer flowing exhaust. This will help out alot, but definatly not as much as a turbo.