[Aussie Mike]

I drove Garrett's Blown LS1 (in 550WRHP tune). Drove is probably not the right word gritted my teeth and bunched my underwear whilst pressing the loud pedal and hanging on is probably a better description.

I also drove Phil's stock LS1 on the same day. I've come to the concluson that a mildly worked stock LS1 will be more than enough mumbo for me.

Putting your foot to the boards in either one is frightening. I reckon 550RWHP on the street wouldn't get much of a chance to flex it's muscles. You would be able to use much more of the potential of the largely stock LS1 without the hassles and still achieve the same silly grin. And at least the mild LS1 won't be so bad for my laundry bill.

Cheers