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Description
Pi Book Test by Vincent HedanPi is an impossible memory effect. You show a small book in which the decimals of Pi are listed, and explain that you memorized it. The spectator opens the book at any page, tells you the page number, and you can tell him the first digits of the page! Then you ask him to tell you a sequence of 5 digits, anywhere on any page. Starting from there, you start reciting the decimals of Pi! Actually, you recite so many decimals that the spectator has to turn
Pi is an impossible memory effect. You show a small book in which the decimals of Pi are listed, and explain that you memorized it. The spectator opens the book at any page, tells you the page number, and you can tell him the first digits of the page!Then you ask him to tell you a sequence of 5 digits, anywhere on any page. Starting from there, you start reciting the decimals of Pi! Actually, you recite so many decimals that the spectator has to turn pages to follow you!
Finally, you ask the spectator's birthday, for example 14th of July. You then reveal the page, the line, and the position on the line where the sequence 1407 can be found in the book!
No stooge
No preshow
No crazy math
No sleight
No peek
No electronics
No dual reality
No pumping
No crib
No svengali-like pages
No stack
Every birthday can be found in the book
"Vincent Hedan has one of the finest, most ingenious minds in mentalism. He creates beautiful, baffling routines that create the aura of genuine mental superpowers, and presents them with beguiling charm, wit and style. To see Vincent is to see a master at work."
- Ian Rowland
"Vincent Hedan is one of my favourite performers. His magic is intelligent, deceptive and most importantly, magical."
- Joe Barry
"I'm a big fan of your work. Your creations reveal the nimbleness of your mind."
- Jared Kopf
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4.3 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Perfect fit for 2020 Subaru Outback
Fit my 2020 Subaru Outback perfectly. 5-minute install. Works great. My previous cabin filter was scary to see.
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Reviewed in the United States on December 16, 2025
★★★★★ 5
Good, inexpensive replacement filter
I've used these filters for a couple years (four replacements) on my Subaru Crosstrek, and they seem to do the job well, probably as well as the original. I generally remove and clean them every three months, and replace them every six.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Save some money by doing your own cabin filter change! (You won't notice a difference).
So, one day I was getting an oil change at the dealership, and the associate told me that cabin filter was pretty dirty, which I believed because of the places I take the car, and she said that they could change it while they were finishing up the rest of their inspection, since they already had it apart. I asked her "How much?", and then we both had a laugh when she said "$90." I told her I'd take care of it.
It took two days for Amazon to get a replacement filter to me, twenty minutes to watch a You Tube video showing how to replace the cabin filter on my car (I watched it twice), and then about twenty-five minutes to replace the filter itself--I keep a messy glove compartment, so a good portion of the time was loading and unloading that nightmare.
In the end, under $15 for the filter, maybe 45 minutes to watch and replace, and the cabin filter hasn't been this good since I first bought the car.
This replacement version was as good as the OE filter, fit exactly the same, there's no difference in airflow that I can tell, and so far (6 months later), it seems to be holding up pretty well. We'll see what it is like after a year. I did get the oil changed about a week ago, and the technician didn't raise any alarms about the filter, so everything seems to be working.
$90 for a new filter? You can do it yourself cheaper.
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Reviewed in the United States on April 6, 2026
★★★★★ 4
Fresh Air Upgrade for My 2024 Impreza
Installed this in my 2024 Subaru Impreza, and it fit perfectly—no issues. The air smells noticeably cleaner now, and it took less than 10 minutes to swap out. The carbon and HEPA filtration does a great job clearing out odors, dust, and pollen—definitely an upgrade over the factory filter.
The build feels sturdier than the OEM version, though it does have slightly fewer pleats. Might mean it needs replacing a bit sooner, but for the price and performance, I’m fine with that tradeoff.
If you’re looking for a quick, affordable way to improve your cabin air, this one’s a solid pick.
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Reviewed in the United States on June 26, 2025
★★★★★ 5
Well built, good fit.
I like it so well, I just bought two more to keep on the shelf for when the price doubles. Seems better built than oem, but I don't know how you can judge the filtration; seems good though.
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Reviewed in the United States on May 6, 2026