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I have an '86 Euro spec model, which I believe started life without a cat (do you know if there is any way I can tell for sure?). The car now has a straight through 2 inch stainless steel system with only a small muffler.
I have run 100 octane Shell racing fuel in my 951. THis is identical to Avgas. Unless you are going racing, I don't believe you can really feel or see the difference in a 951 (and here in Australia our ordinary fuel is absolute crap). Whereas my dad has a 1962 122s Volvo and a 1979 Chev Camaro 350 and says he can feel the difference in both of those cars with Avgas. Unfortunately we can no longer buy Avgas.
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1986 951 Euro spec model
Anthracite on black
105,000 km
K&N, Lindsey Boost Enhancer, chipped, oversize fuel regulator
968 Club Sport anti sway bars
Adjustable Koni Yellows
Fuchs alloy : 9 inch rear, 7 inch front
2.5 inch stainless steel exhaust
1984 928 S2 (Jap spec)
1977 Mazda 323 - hard core tuned
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