Yup the ls1's are beasts. I use to have a couple Ls1's. 99 C5 and a 02 Firehawk. So with the list of cars you can see i feel the power is inadequate sp? ya pretty much name it I have had it. Not braggin' I just like my cars. I feel the the XF witha Catback would yield 7whp or so cant see anymore.