performance wise type rs is better, so trade it if he wants the type-s just look at the piston size, its bigger therefore the swooshing sound, not the high pitched noise. if you are planning on a big turbo go with the type-rs, and the type-s has a diaphram in it that you have to change out over time, type-rs does not, the sound reminds me of the txs rfl, just my take on it i have both so i have best of both worlds. i am keeping the type s cus wife is getting a srt-4 when she gets back from iraq. goikng from a big ass f-150 to a neon damn what change
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