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I have a 13 GT with a Roush supercharger with a 79mm pully. I'm playing on installing billet OPG and wanting to install smaller pully. If anyone has any info on this and will share, I will really appreciate it. Thanks
 

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Not sure what boost your running but would not go above say 9 lbs with a stock motor, and that assumes a good tune. I know some will say higher, but for the street 9 is fine. And any pulley change will require a new tune. Sray safe my friend!
 

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From what I've read the above info is correct. I'm still running the 82 pulley to be safe. 79 would be the smallest "safe" size as far as I know on stock motor. I'm sure a tune could be written to keep it safe but then your not getting the full benefit of the added boost so why bother?
 
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