As James states above Sheedys twin scroll manifolds and bw turbos etc are low lag,the stuff Sheedy is doing now is light years in front of anyone else that I know of on the cossie tuning scene.Ask Dave Pritchard or Mark Hudd both have these sort of set ups now and no lag factor,I think this is the only exception to what i mentioned in my post above,with Sheedy though you would have to go with an aftermarket ecu such as Vipec or Autronics really as he doesn't map Weber ecus.A new Vipec is 3k supplied and fitted for a cossie but you can get a second hand autronics for around 1k.It's a lot of money to do the aftermarket ecu,twins scroll set up etc especially if you want to remain with the sort of power you have now.

Thanks.Lee.