14-10-2013, 05:14 PM
If you have a petrol, a cat (as far as 306's go) is a must.
If you have a diesel, you don't need a cat as it's just a smoke test, and you need at least 1 box in the system - so your backbox will do.
If you want a full straight through, weld a straight pipe through a cut open box so it appears to the MOT tester you do have a box.
If you have a diesel, you don't need a cat as it's just a smoke test, and you need at least 1 box in the system - so your backbox will do.
If you want a full straight through, weld a straight pipe through a cut open box so it appears to the MOT tester you do have a box.