Review on Flowtech 50251FLT Hots Glass Muffler by Dustin Marshall

Okay, that's short/long. I was also confused by the "size selection" and this worked for me. I was looking for a specific car in my Revain garage and found the right size (hope this helps). I would hate to have a non-OEM aftermarket, sizing may vary but auto parts stores sell various adapters cheap. I installed this on my 1987 4Runner 22re efi. Sounds pretty deep and louder than the stock setup (ignore my power steering pump). I give 5 stars for fit and lightness. My ONLY complaint is that you don't have cutouts to clamp the pipe unless you weld the Flow Tech ends. It is difficult. I got around this by cutting my own 2" slits (3 of them) so I could push and squeeze the flow technology onto the pipe to create a seal. In my experience, if there are no gaps when clamped, the end will deform and break the seal. The price and quality are pretty good. No complaints yet.