I run Mind Train mufflers on my car because, after some research, I concluded they are the lowest restriction mufflers conventionally fitted to Panteras in a 90 degree header application. In fact, I have been advised that after some controlled testing was done, it was found that some other vendor's exhaust systems actually created more back pressure than the stock ANSAs so, for me, the choice was clear.
For a visual comparison, have a look at the Mind Train brochure posted on the following PIBB thread:
http://pantera.infopop.cc/eve/forums/a/tpc/f/7650045562...560097263#7560097263My Mind Train mufflers are a 12" glass-pack or bottle style with a 2 ¼” custom-made spiral louver core and a 3 ½” outer shell diameter. As I recall, Fred said they are made of something like aluminized steel (if that makes any sense).The tips are 18 guage 3” diameter pipe. Fred also supplied me with the 2 ¼” resonators for insertion into the tips. All of this is used in conjunction with a full 3" exhaust with crossover system based on Fred's design.
To add to Matt Bradley's history, Fred had so much success with his exhaust designs that, after he left PI, he started a high performance exhaust business which he still operates to this day. The only problem is that he now specializes in rice burner exhausts and no longer stocks mufflers for the Pantera. When I bought mine about a year ago, they were the very last ones he had.
I believe Fred set a world speed record in a Mind Train exhaust equipped Pantera after having driven the car all the way to the salt flats from California!