over time they just lower the center of gravity of your engine...i have an NA with them, and its not because of the turbos or heat... they just get smaller... mine did so until the silicone intake couplers broke, because the engine dropped so low compared to the hard pipes. they eventually turn into noltec mushrooms. SRC="http://www.flickr.com/photos/21520187@N05/32350417 3 7/">
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