I have had one of Steve Parker’s systems on my 109” since I completed the conversion in 2007.
My setup has Defender 200tdi manifolds, and Parker’s had a kit that bolted pretty much straight on.
It comprised of a bespoke header and intermediate pipe, and then went into a standard 109” V8 silencer/tailpipe.
It was easy enough to fit, and saved me a load of mucking about at the time when I had pretty much had my fill of mucking about getting the engine in and running. I found that the rear silencers seem to last four years or so, I’m on my third replacement (so four in total), but they’re cheap as chips, easy to get and simple enough to change.
Would I buy another? Probably not. It follows the route of a Series 3 diesel, which is convoluted and tight enough with a standard system, and getting the bigger bore pipe in without it rattling on something along the way is challenging. Also, it relies on an oversize version of Land-Rover’s standard exhaust hangers, which are a bit pants at the best of times and don’t really like the extra weight and vibration. After 13 years of service, the intermediate pipe had holed where it had a clamp around it, which I didn’t think was too bad, but I made the decision last year to patch and refit it rather than get a new one the same. Hopefully, when restrictions lift, I am going to have a complete stainless system made to fit, with decent V-band couplings, proper hangers, and maybe a less torturous route.