Titanium 182
Will it fit? Obviously I'll have to get the bumper to accomodate it, but I was just thinking it'd be a bit different seeing it on a flame red! 
Loads of threads on this, won't fit, manifold, cat, are different and the 172 has a spare wheel well in the way. 182 look exhausts are available on k-tec.
But i prefer the look of the 172 rear end anyhow.
For some reason I always think that 182 style exhausts look odd on 172's I don't know why though.