Just wondering if anyone has any experience with this company and/or their pulleys? They offer a 58mm upper pulley for the 3.0 which is ~6% reduction over over.
Also, would anyone have a formula to estimate what the RPM ranges for the supercharger would be with a 58mm pulley?

 

sorry about the previous post, user error for attaching pic

 

Powerhouse are a top business with a great reputation, good products & great customer service. I've dealt with them a lot over the years, along with many others.

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Lots of discussion over on the F-Type forum about pulleys for the V6 and it has been firmly established that a 6% smaller upper pulley (which is as small as you can safely go with the V6) is a waste of time and money and a larger crank (lower) pulley is a far better option. It's also easier (and reversible) to swap out the crank pulley, however you will need a tune with the crank pulley to reap the benefit. Several sellers of crank pulleys and tunes for the V6 including VAP and Eurotoys and I think Viezu, and maybe Powerhouse as well.
For example the VAP crank pulley and tune safely takes the basic 340 hp V6 to 450 hp, I have been running this pulley (well the Eurotoys version) and tune for over two years now with zero problems.