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@TJosh02 - I believe the issue with the larger tanks is this: See the 45 degree angles on the front corners of this tank? The angle creates a space for the exhaust to pass between the tank and the coils / shocks. The larger capacity tanks loose that angled corner and are square there - that is part of the reason for the extra capacity - and you therefore can't get the exhaust past the tank with a stock-like layout. Outbourding may help that, but I'm not sure.
Does that sound correct, Rick?
That could be part of it.