ORIGINAL: OldRookie

I see the J'tec Pitts muffler comes in 2 sizes for the DL50.
The regular one is $89.99 and the large is $139.99. It says in their description, that the large Pitts Wrap Around has twice the volume of their regular Wrap Around Pitts muffler. Is this extra volume a big plus? Would it be worth the extra $50.00?
I don't remember anyone commenting on the J'tec large Pitts muffler, so if you have used one or seen one used in a plane let me know. I wonder what the physical size of these mufflers is? Neither web site gives any lengths, diameters, or angles of the mufflers.
The Slimline is $119.99 for the model made for the DA.
These are retail prices on the manufactures web site. Is there an alternate discounted source for these mufflers?
Why does it seem as if everyone is down on Pitts mufflers? Do they rob that much horse power? I wouldn't mind using the stock muffler that comes with the DL, but most of the comments on the stock mufflers is that it is too loud, not a good exhaust note, and they fall apart and need to be replaced occasionally. If I cut my cowl to accommodate the stock muffler, and don't like it, there will be a big hole in the cowl where it was.
The plane this will go in is the TOC/SD Yak 54.
There is a tunnel in the YAK that would allow cannister or tuned pipe. Would one of the aluminum bottle mufflers be quieter, take less horsepower from the engine, or have a more pleasant exhaust sound?

Greg