well my friend, synapse engineering is a top notch company, making extremely high quality produts ..i would rate there offerings as equal to, (my favorite) HKS, APEXi, SARD, some TRUST(GREDDY) products,,, and yes it will perform and do exactly as it says it will.. your friend will be very pleased..
your link brought me to synapses homepage.. so i dont know exactly what product your talking about ..but i do have experience with there rising rate FPR, and there wastegates.. both are smooth, well built, and fully adjustable units.. and we were very happy with them..
hope that helps... if i didnt quite answer the question, please ask it again or more specifically, and ill try to elaborate further...Joe, RCI Customs