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On my stock Z06 we got 530rwhp at 6-7psi (aka ***** boost ) and everything was stock. The first and only real problem was the clutch slipping, and replaced with a Tex, along with a few prudent mods for racing durability: a hardened output shaft on driver side, and rear end DTE brace. I eventually wanted more power and it's over 650rwhp on 10-11psi now, with no other changes but meth/alky and Borla cat back. I look forward to a forged setup and more boost, but for now I enjoy this car alot, it's been trouble free and just stupid fast.
So i could add the TTI X to a stock motor and run low bost on stock internals with moderate drive train upgrades
Correct. That's exactly what I did the first year I had my X kit. I ran it with a stock lower end and an upgraded clutch with a hardened output shaft. It made 600/600 (on a Mustang dyno) with low boost on pump fuel without meth.
When I eventually wanted to upgrade - just because - the car was already plenty fast - I had a purpose built turbo motor installed along with an RPM transmission.
There is no reason you can't have fun with a stock lower end with an X kit.