In terms of performance, I wouldn't think it's notably better nor worse than the Simons. I'm told, but can't confirm, that the Abarth systems were prone to rusting.
Performance gains from either will be directly related to what other modifications the engine has.
The Simons I've seen start with the headpipe and include a complete system; the Abarth connects to the stock pipe that's under the passenger side floor and includes replacement pieces only from there aft.
I'm the Swedish Relics Cam.
Cheers --
Cameron
Portland
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