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Originally Posted by dowNNshift
SiCop -- I initially noticed some of the vibration too, mainly when the Si is cold. I like your washer idea though!
Gas milage wise, I've been getting 27.4 mpg combined with the new kit. I can't complain with the governments rating of 23 city. So far I've run 3 full tanks through with it, about the same whether I am driving spirited or conservatively in 6th most of the time. I am sure over time the Si's computer will adjust.
My only complaint so far with this new kit after a month is how my Si's throttle gets cranky when its below freezing outside. I think the stock intake optimized the air for cold mornings.
All-in-all, I'm still happy with it. One of the best quality ones on the market.
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Did you guys ever end up doing the washer idea or not? Did the rattles just go away? I just ordered my Typhoon tonight!!!

I want to know whether or not I need to pick up these washers prior to attempting my install, if that really helps kill any potential rattles. By the way, great DIY write up dowNNshift!