Can anyone tell me what turbo they would recommend for my cossie at the min its just been setup running 363bhp on a t304 turbo but feels very laggy to me. Im looking for a turbo that will be good for 400bhp and a less lag as possible cheers for any advice

 

A t34.63 will run that power but it would be stretching it at 400bhp. But for that kind of power would be the best and cheapest alternative to less lag etc.
Still looking at nothing before 3500 rpm though.