The normal TD05 16G are ment to be fairly laggy, ive never ran one so couldnt say how bad, set it up with a good EBC, short IC pipes, heatwrapped system etc and it should bring spool times down a tad. They can be pushed to about 1.6 bar maybe more so should see well over 320 bhp on a good setup. Can also go for 18G which has a bigger compressor housing, or a 20G which is bigger again. What are you building the car for ? Have a look at the VF series turbos, a lot of them have ball bearings which are quicker spooling and can still make great power. Turbos like the VF24 & VF35 are suited quite well to the 4E.