I'd suggest getting a BTB-they supply the likes of Prodrive etc and beleive they've done the systems for the palmer corporate fleet. Some of the exotica they've worked on are unreal.
Main website:
http://www.btbexhausts.co.uk/
Link to the 172 stealth:
http://homepage.mac.com/mattsearle/stealth/
Certainly very happy with mine-imo is a work of art. Isn't a lazy or half arsed copy of the standard system, neither is it a mimic of another s/s system on the market. Is a bespoke design from the ground up for the 172 with the aim of getting it as quiet as possible without being at the expense of power/torque. Nice and quiet low down and sounds awesome 4k+, equally pleased with the performance. :approve:
The additional mount on the rear box to support the extra weight of a stainless versus the lighter OEM setup is a nice touch too (The JP Exhasusts/Yozza stealth deosnt have this :dapprove
, as is the price-£349 for a BTB versus £374.99 for the JP/Yozza.
Would certainly recommend the BTB-likely to be also be going for their mod to fit the fewer celled 182 cat, rewelding it to give larger, less restrictive inlets/outlets with 172 fitments that don't need faffing around swapping out every time it goes for an MOT.