The flat 4 collector isn't very good compared to a traditional stacked, stacked merge, or tri-y merge collector. The guy at Cone didn't elaborate as to why but I would guess it's a manner of flow velocity. Not sure what the guys at SPD think of their flat 4 merge collector though. I might shoot them an email. I'm still faced with the same problem using a flat 4 collector as a flat 4-2-1 collector arrangement though. If I go shorter on the primary tube lengths, I'll be able to use a stacked 4 into 1 merge collector.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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