Yea looking at the LT5 is does have PI, I stand corrected. Porting will have a much more pronounced result on the PI LT5 due to the increased boundary layer within the blower, but this boundary layer also effectively limits volume which is why we see little gains porting our stock LT4 with DI blowers. Also why the AFR didn't fly off the handle with the LT5 I'm assuming.
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