I have got a miltek back box on my car and have a Pre Cat pipe to be fitted to the car and now i want to buy the rest to make the full system but do i need to buy all these new bits as i have been on to Courtenay Sport and had look on there site at full systems and there was this list
1.Turbo pipe (already got)
2.hi flow cat assembly
4.over axle pipe
5.rear silencer(already got)
do i need to buy it all or just the hi flow assembly to make the full system??