Actually Joe, about the only things we can do in IT that you cannot do legally are:

1) Cold Air Intake - but since nobody makes an effective one or has been able to get one to make power to this point, it's a moot point.

2) Port matching - not worth much hp.

3) Increase CR a half point - good for about 3-5 hp tops.

4) Alternate engine management within the stock ECU box - but so far there is nothing that fits that would work wtih the stock wiring harness so this is also a moot point.

In the end, the only that really keeps your cars from making more hp is people willing to spend the dough. You can do all the little things Jon does that makes hp and I have no doubt he could build a legal engine for Spec 944 that would make within 5-6 of what his IT engines make.