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Message: [QUOTE="andrew, post: 779500, member: 16274"] Rohdster, you said "Lowering overall port height focuses the power band on the bottom end and raising port height (especially the exhaust) focuses the power to the top end. Lowering compression softens the bottom end while allowing for more top end run out. Raising compression adds to bottom end response while limiting top end run out." Then by adding that gasket, what I have done in effect is to firstly raise the port height, focusing power to the top end (at the expense of the bottom); and secondly lowered compression thereby softening the bottom end response and getting more snap and top end run-out. That seems to go with what I have just experienced, so thanks for that. Still interested in any comments as to how much effect one would get from the addition of the one gasket. Is it really that touchy??! Thanks heaps, Andrew [/QUOTE]