Avit mate i got one fitted on 172 the other day and they are brilliant. I remember asking for att quote for just getting my exhaust fitted and it was £475 but when i decide to go through with it i ended up getting coillies fitted too so the total price was £655. If nobody has posted pics later i'll get some for you when i get home, cant just now i am at work.
you can do this very easy mate i have seen it loads its evan on the miltek web site
No mines not for sale mate, that was ad from when I bought her