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sequential shift transmission is not cheap..basically allows u to shift up and down through the gears doing away with the current H pattern all manuals have.. i think cheap ones would be under 10k and these can go up until 20k or more. brands such as Holinger, HKS, Trust and a few more..im not sure coz i cant afford it anyway

a blow off valve is just a noise maker that has no function lol it goes pssh... nah just joking :) well a blow off valve has nothing to do with sequential transmissions other than the fact that they both belong in cars... a blow off valve is a valve with a moving piston in it that is located just before your inlet manifold and what it does is that it plumps back the air back into the cycle or just vents it to atmosphere when you release throttle. the objective is to prevent compressor surge whereby the air is trapped and has no where to go but the way it came from and that basically causes the compressor wheel to spin backwards...long term damage to turbo :(

i know im bad at explaining and im prolly not 100 percent spot on but i gave it a shot :D

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