A new cat, hollow cat or straight pipe will help things some.
You need to make sure you don't have any basic CIS issues. I presume you've replace the fuel filter?
As for the CO tester I don't think you need one. If you want to verify your base mixture I think you can hook a dwell meter to the oxygen sensor leads. But to really understand your tuning through the power band your better off with a wide-band air-fuel gauge.
I'm presuming your in the US, and have working Lambda. Do you have a working throttle switch for lambda enrichment on your throttle body? Without enrichment your 99T will always run lean under boost. Even with lambda enrichment you may not get great power unless you modify or replace your warm-up regulator with an alternate such as one from an Audi. I had a warm-up regulator with vacuum enrichment custom built for my 99T, and have lamdba bypassed altogether.
posted by 76.204.12...
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