Here's a few sound bytes of the different engine sounds.
Lexus 4.0 Quad Cam:
Vrooom Vroom Vroom Vroooooommmm
LS1 5.7 Aluminium Chev:
Brummm Brummmm BrrrrrruuuuuuMMMM!!!!
Ford 5.6 Iron Windsor:
Braaaaaapppp! Braaaaaaapppp! BraaaaaAAAAAAPPPP!
I've tried all of these sounds whilst sitting in the unfinished shell of my Cobra. They all sound pretty good but the windsor does make a bit more spray so having a beer on hand to whet your whistle is handy.
Cheers