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			It is different. 3 ch have only one line going from front to rear. 4 ch have two brake lines from front of the car all the way to rear. And 3ch have speed sensor in the pumpkin, 4 ch have speed sensors by the calipers on each side. I think it's all the difference... might be something else.
 Alex.
 
				__________________'96 camaro LT1 m6. full bolt on and suspension.
 *FOR SALE* '05 Dodge Ram 1500 Hemi QC. CAI & exhaust. some appearance mods. *FOR SALE*
 '94 Chevrolet Beretta Z26.
 '97 Honda Accord EX v6 2.7l. CAI & exhaust.
 '03 Suzuki Hayabusa GSX1300R. RWHP 182/RWTQ 116 (w/o n2o). can't even remember all the mods I've done to it.
 Engine,trans,brakes,suspension, #50 N2O...
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