Originally Posted by Patrick G

Going from XE lobes to XFI lobes would gain you around 5 rwhp. While this is basically free hp (same drivability), you will need to run more expensive dual valve springs and you will have a noticable increase in valve clatter. Not my idea of stealth (if you're wanting to be sneaky).

Also, the LS6 lifters in the CTS-Vs are not any quieter than other factory LS1 lifters.

Originally Posted by Sharpe

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