Holeshot currently makes an exhaust for the V65 Magna.   I have purchased one, installed it, and my opinions will follow. 

I had a few difficulties, namely the opening for the rear downtube connections were way to small for the connection to the rear pipes. It was impossible to install the gasket. I had to take the pipes down to a local shop and have them widen the pipe.  They did not have any pipe spreaders small enough, so they had to remove some sections out of a larger one.   This made the hole sort of 'square-ish, but they were able to widen it enough to fit the gasket.  On one pipe, they widened it a little too much, and the pipe split.   I had to have it welded.
I put the pipe on the bike, and my first impression was LOUD!! The pipe is extremely loud.  I would not recommend it for the street.  Even with earplugs it was obnoxious.  Dale Walker states this in his brochure, and he is not kidding.  This is not a street exhaust.  Going by the 'Loud pipes save lives' example, I was saving lives for miles around.  I have been trying to locate an aftermarket slip-on that would make the pipe less obnoxious, but so far I haven't located one.
Now, if performance is your only concern, or you are nearly deaf anyway, then this is the exhaust for you.  Dave Dodge estimates a gain of 5HP when jetted properly.  The following photos are of the exhaust as purchased.  They are NOT chromed, but nickel plated, unfortunately.  The slip on is a hollow pipe with insulation packing around the outside.  Below the pipe photos is the instruction manual that Dale includes with the system.

Summary:
The Good:
Lightweight (I could feel the difference)
Better performance (More HP throughout the band)
Centerstand and oil filter access OK
The Bad
LOUD!! 
I had to modify the flanges (I don't know if this has been corrected)
No chrome plating

Dale Walkers’
Holeshot Performance Products™
Vortex 4 into 1 Exhaust System for V-65 Honda Magna
Installation Instructions

1. Please take a minute to fully read all instructions before you begin installation.
2. Remove the original system as shown in the manual. Don’t forget the bolt above the collector.
3. Install Flanges into front ports using original nuts. Be careful not to disturb the copper gasket and check that the flange is centered on the port. Spring holes should point toward the center of the bike.
4. Use a high temperature sealant between all pipe junctions. We recommend Permatex™ Ultra Copper.
5. Install New Honda™ gasket, part number 18391-ML8-000 into collector.
6. After applying sealant, push primary tubes onto flanges.
7. After applying sealer to the inside of the collector/front primary junction and placing the original clamps on the collector, install collector being especially careful that the gasket slides onto the rear primary tubes without damage.
8. Install the support bracket from the collector to the boss on the underside of the engine originally used for collector support using the supplied bolt, nut and washer. Tighten the clamps around the rear primary tubes.
9. Install the retainer springs to the primary/flange junction and the primary/collector junction. Use a wrench and wire to make a spring hook for ease of installation as shown.
   
   
10. After applying sealer, install the elbow to the collector being careful to align the spring loops. Note that the wire bracket for the blow-by hose must be relocated to the opposite side of the centerstand bracket to provide clearance for the elbow.
11. Install the supplied bracket as shown using the supplied bolt, nut and washer.
    
    
12. After applying sealer, install the muffler, again being careful to align the spring loops. Note: only one spring is required. The extra loop is for alignment, if needed.
13. Check the entire installation to be sure there is sufficient clearance between the exhaust system and any hoses, wiring, etc.
14. Start engine and look (listen) for any leaks.
15. As with any free flowing exhaust, jetting changes may be needed for full performance potential to be realized.