I have the GruppeM, and had it on for a few months before I installed my exhaust. The intake will give you an amazing sound above 4K, anything below that and it's very subtle...but man when you hit that 4K mark...it is pure heaven. Worth every $ spent in my opinion.
Exhaust gives a great sound, but in my experience, the Remus sounds different only when you really step on it, and during higher RPMs. ZeD4Mr gives really good points above though, weight savings are good, but to be honest the Remus sounds so similar at startup to OEM it's hard to tell. I'm sure you've already seen the exhaust comparison video we did a few months back, you can get a good sense of how it sounds compared to OEM there.
If it were my choice between those two exact items, I'd actually go with GruppeM.
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