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I bought my 4.8iS with Dinan stuffs on there already. I've never driven a stock 4.8iS before so I couldn't make the comparison for you. My iS has CAI, throttle body, exhaust, stage3 engine and tranny software. The sound is great, very deep rumble sound. Power is everywhere. It takes off and pulls like a freight train.
If I can afford Dinan price, I would do it since their stuffs are proven.
Good luck.
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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)
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