I really don't like the Powerflex bottom wishbone bushes, they're not a good design & put a ton of noise and harshness into the cabin. Also, these bushes only fit genuine Alfa wishbones, as the aftermarket ones use different diameter wishbones, so if you do want to Powerflex the bottom wishbones, before starting the job you need to be sure you have genuine ones fitted.
On the otherhand, the Powerflex upper wishbone is a great modification, they offer much less movement than the originals and will last a lot, lot longer too. We have contacted Powerflex about the bottom wishbones, but there isn't a new design yet. We do testing for them at our Bedfordshire branch, and they come to use every now and then with a few different designs to actually try them out before putting them into production.
Might be worth you bringing the car over for an assessment, we can see what is in good condition and what is not so good, in terms of the suspension & floor. You can have a go in my Sportwagon and see if you like it, then if you do then the shocks & springs can be tackled at the same time as wishbones, which will save you quite a bit on labour. My Sportwagon also has the rear hub bushes Powerflexed, I can show you how little these move compared to yours which are no doubt still rubber, you can feel the difference with a pry bar.
If you want that oil changing I can do that too, its not a lot. Fuchs 10w60 oil is £28 for 5L, genuine Alfa oil filter is maybe 6 or 7 quid, and we'll have it done in a half hour or so.
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