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      01-08-2013, 11:32 AM   #10
Private First Class
Drives: E46 M3, E92 M3
Join Date: Mar 2011
Location: Bay Area, CA

Posts: 125
iTrader: (1)

Valved systems are like two systems in one and offer the best of both worlds. Once you have a valved system it's hard to go back.

I recommend a system that uses vacuum controlled valves (like IPE, Kreissieg, etc.) instead of electric valves so you don't have to replace them

Also, the standard, non-F1 system from IPE has a superior x pipe design that doesn't impede flow like the F1 x pipe.
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