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well guys this weekend we were busy around the shop, we installed and fabbed up 4 different exauhst styles. the 1st one was a 3" header back system. car felt very slow on the bottom end and we deffinatley experienced some power loss. it was very noticable. the 2nd system was a 3: catback, felt better than the headerback but we wanted to keep on testing, the next system was a 2.5 header back it felt good better than both 3" and last but not least we did a 2.5 catback. wow!!!!!! the car pulls hard sounds mean and we gained bottom end power as well as lots of top end. now you may ask, wait the stock system is 2.5, not really some of the parts of the stock systems were 2.5 but most of it shrunk down to a smaller diamater 2.25 and even smaller plus it had some very restrictive bends towards the rear axle. here is the video we will be dynoing soon