170bhp on low boost really doesn't sound worth the effort to me
i put my turbo on still using standard internals and saw 230bhp at 9.5psi. only thin i had was a 1.9mm hg to lower the compression slightly. i ran the car on more boost too and still had no issues with it and it did make for a genuinely quick car.
just a bit of extra info to add there, you don't need to go all forged to get a decent power gain.
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