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Did anyone add header and full exhaust at the same time? I am in on the group buy for the hot shot header. I already have a Tsudo performance muffler. I've ordered the Catco high flow cat from Summit and and getting 2 1/4 piping all the way through. I was wondering if anybody added something similar to this at once, and was wondering if you got a decent gain from it? I know to not expect tons of power, but would like to know you get some gain from it. I am running Ractive 9mm wires/NGK plugs and Ractive WAI on the motor. Thanks!