well i know Tenzo is a crappy company...they sell knock offsame with aerospeed..and matrix...as far as Obx...they are another universal muffler company...of which 2 of my friends have there mufflers..they are a GREAT sounding muffler..and great quality..both have had the mufflers for over 2 years..and have not had any problems...they are well worth the $$...wish i could say the same about some "brand" exhausts and mufflers