IF you check thru the search engine or even jog your memory you will find several threads about some experiences owners have had with twinspark conversions, particularly that the plans they had to aquire certain necessary custom built parts has been such a dissapointment. They can not get a response from the vendor (2 years in my case), or they have paid for parts that they don't receive, and they are well aware that others have gotten parts and answers in far less time. This forum has been very clear about these posts being inappropriate. These owners have had to find alternate sources, or pay the exchange rate for parts, they may be no more interested in discussing the positive aspects of this alternate society, (not secert) than you are in discussing the dissapointments they have experienced within your TS society. You want info on the before and after performance gains, well these conversions are not new, and neither are the well stated opinons of core members that claims that 4cyl Alfa's can keep up with WRX's or entry level BMW's and Porsche's are pure BS. Perhaps these owners prefer not to revisit that subject. When I started planing my SC project the post got not one response, a later post as the project proceded resulted in a response that the supercharger model that is the base of this system doesn't exsist and that I should follow the lead of another members work, We are using different approaches and they are not quite compatable. not a matter of right or wrong, just different, shouldn't be odd that the system and info your community receives would come from the source that you support.