Originally Posted by v man
cosworth invested 1000's to make the standard one my saph is on greys and runns 32 psi what more do you need , the onlt thing i would do is space the standard one
this sort of mod is for over 550 bhp or more realy it just looks good so if it aint broke dont fix it
I was assured by every established tuner of big power cossies that the standard (non Rs500) plenum was restrictive and inefficient if you were looking for over 400 bhp. None were trying to sell me anything but all were telling me to get an RS500 plenum.
In the end I did my own research and bought the swedish one with the bigger injectors.