to the exhaust cams. In talking to Greg at SZ, he said the 400+ cams respond well (pick up a decent amount of area under the curve and additional peak HP and TQ numbers). Even Clark at JWT gave the 4* his blessing. JWT put the 4* advance into the 400+ cams to get the turbos spooling quicker. It seems that removing the 4* of advance results in good gains. The one thing I don't know about is how the transient response is affected by retarding the cams.