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I'm new to Z's so please no flames. 1)Why do a lot of Z owners upgrade to Skyline brakes vs. Big brake kits? are the skyline brakes better? 2)What are down pipes, test pipes? 3)How much boost are the stock turbos good for? 4)Who has the best strut tower brace and sway bars. 5)I just installed Greddy Power extreme cat back. What type of performance should I expect?(Car is stock except for K&N filter) Thanks for the help in advance. MannyB
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