I have the same basic modifications as you. Believe these guys when they say low end torque will be effected with 1 5/8" unequal headers (use 1 1/2"). I Just installed BBK 1-5/8" unequal length headers, BBK off road “H” pipe and Dynomax Super Turbo catback exhaust. Definitely lost some low end torque, But it sounds great.
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