hi, ive recently got a cut-out fitted but was quite dissapointed in the sound it makes. it sounds great when running stationary but when you start revving its still pretty silent. ive seen the huge as catalytic converter under it and went looking for a downpipe. i found a few but was wondering how hard it is to swap the stock one out on my own (or with a helping hand) using jack stands? because i want to be able to change it out to pass inspection and its just way to expensive to get it changed by the garage every year.