I just about 148K on my 05 r53. While giving the car an Italian tune up. I heard a pop and my car sounded like a back firing race car.
The sound is coming from the cat area when I checked under the car.
I was thinking about getting the Rmw headers and call it a day but I would like to do that when I have the funds to do the exhaust as well.
Anyway would you guys help me source out a good used one. Thank you in advance

 

Check near the headers. It's not uncommon for it to crack near that area. You can have it welded as the cheapest option. A local exhaust shop might be able to do this for you until you have the funds to purchase a full exhaust.

When it comes time for the exhaust, be sure to consider REMUS. Lots of great reviews from MINI owners on the forum here. Great quality, sound, craftsmanship and warranty. If you have any questions let me know.

 

The pre-cats often crack here. Also, check your motor mounts as excessive engine movement usually causes this to happen.