I bought my Powerdyne BD11 (upgraded from a BD10) used off the internet. It came with just about every nut, bolt, and washer from the original kit. It was a 6psi with the 9psi pulley included. A vortech aluminum discharge tube and pretapped for the bypass which was already installed. It also came with a MAF relocation kit. Since I don't have MAF, I just relocated my air filter in the fender.

The BD10 Manual that came with mine was not more than 8 pages of simple hand drawn diagrams with 5 simple instruction on each page, but it gets the job done. The first thing I suggest is to have all your tools ready. It took me about 14 hours over two days to install the entire kit. I'd say if I had all the tools required it would have taken about 10.

The first problem I ran into was that the IN and OUT lines on the FMU were reversed. Now I don't know if the previous owner installed them incorrectly, but based on my directions and a quick call to Powerdyne confirmed that they were on wrong.

A 86 does not have the fuel schreader valve on the return line behind the ALT, it is on the FPR mount. So keep that in mind. One nice option is to get a 87-93 return line so you have two schreader valves.

A 6 and 9 psi pulley look very similar, you almost can't tell the difference unless you hold them up to each other. The belts are different lengths also (I think by .5"). I know on mine the 9psi belt will not work for the 6psi pulley (too tight). The tensioner can be mounted several different ways also. There are two sets of mounting holes and the bracket can be mounted upside down. I had a problem that the tensioner bracket was hitting my smog pump and I could not get the belt any tighter. So I ground the edge of the tensioner off. Worked great, there is a lot of metal on the ends of the bracket to work with.

Note: you don't want your SC belt to be so short that you don’t get any wrap around your pulley, its better to have a shorter belt with more pulley surface area than one that makes a perfect oval, better to have closer to a "8" shape.

I keep my belt pretty tight. One indication of slippage is boost that levels off or degrades with increasing RPMs. Keep an eye on that boost gauge, especially if you suspect slippage. At the track I noticed a top off at 5 psi around 4700, it should have kept climbing to 6 or 7 around 5200, so I tightened it up a little more. I keep the belt a bit tighter than the stock Mustang tensioner keeps the serpentine belt for a reference point.

The supercharger creates no ill effects on normal driving and the only indication that its there is a slight wind during idle and slow rpms, sometimes you can hear it at higher Rs but with my exhaust, you usually don't.

Here is the Powerdyne assembled on my kitchen table and me for scale (don't try this at home);