I have a turbo diesel micra 2010, its been lowered 60mm, 17 wolfrace kn filter and power box. If I took the back box of and just put a 50mm round length of exhaust pipe what would happen. back pressure would be ok not high and I may get a better sound , I did put on a cherry bomb but it don't fit right do to shape , you did get a good throaty sound at top end power , but has I say unless I spot weld side brackets its loose .