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A little update/review on the Gruppe-S header.
At first start-up after installing, it was VERY loud. After the initial 45-50 second warming it became very subtle. Paired with my EVO GT catback it was a very aggressive cold start that if you were standing behind it or slightly off center to the side it would probably make you want to cover the ear facing it. Now after flashing it to stage 2 and letting the ECU do some learning for a week, it has quieted down a lot. Initial 15 seconds of cold start is still very loud to where I feel I am disturbing my neighbours at 6:30 in the morning, but hardly noticable after warm-up. I also noticed that at lower RPM with highload it certainly sounds like it's moaning to be downshifted. Passed 4k RPM this setup sounds so manly I feel like I'm actually growing a beard, then when I upshift into the lower range it receeds. As far as performance goes, the almighty butt dyno def says there are considerable gains with the stage 2 tune. I would like to say it finally made the back of my head regret not being rested on the headrest when I decide to go WOT.
I will try to get some sound clips, I have no help for this so I still need to figure out where and how to do this with a smartphone.
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