Quote Originally Posted by stndrd View Post
They look similar to my Hytech ones, but I can't see anything else so I can't say if they are 4-2-1 or 4-1
Jack the car Up and look at the pipping, so you can tell if it's 4-2-1 or 4-1. If all 4 pipes combine into 1, that's mean it's 4-1. If it's 4pipes separte into 2 pipes than all combine in 1, it's 4-2-1.
If you wanna check the ID, take off the extractor from the cat, and measure the inner diameter