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Id take it straight back down and kick off to f**k at the service manager.....
Did they test drive it after fitting the pads? I know most dealerships do!
all have unstable idles, its the cams iirc....
as for the slight resonance from the back box, it could actually be early signs of the 4K rattle which is a knackered cat or middle section, I forget which!
You cant argue with the fact that on some peoples cars it works!
I put mine on, better throttle response and feels better pulling in higher gears.
Some people (ok, might be most) that have had one dont think they work but their are people like me and Tucks, had ours set up properly and they...