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Adding meth to your ps2 would allow you to run a fare bit more boost and timing. I'm not at your altitude but I run 24psi and 10 to 11 degrees of timing on my ps2 as a daily with 93 and 70%meth.
The speed tech turbo is much more capable than the ps2. Not just the turbo but the exhaust manifold is much more free flowing. The turbo also spools much faster. Almost like oem.
If my goals were yours and I could do it for a steal, I would definitely go the speedtech route. But it may be worth putting in the meth kit and extracting more from your ps2 and see if you are happy first. Meth kit is an easy install.
Should get you into the 500s hp wise.
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