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87 vs 91 You do realize that an engine designed to run on 91 octane will over time deteriorate at a much much more rapid rate if you are using anything less than 91 octane. Also even if you were to have a program installed on the engines computer to handle 87 octane it would still destroy the...

Thank you everyone for you input it has been very helpful :)

I've been doing some tuning with my 6 and I have not been able to find anywhere what the compression ratio of the engine is. I'm just wondering if I were to put a cat back system on it and the engine no longer has any back pressure then will that be a problem?