If you want an oval its supersprint or blueflame really that do the best as far as i have read
Milltek do not do an oval for the LC just the LCR
I have a blueflame and its louder than probably i would like it to be, I hear that the supersprint isnt too loud.
If you're hapy to go OEM i'd go milltek. Well tested, good performance and not too loud just a nicer sound