I do think that 1.5 is nothing !!!
I have 1.48 and my car is totally streetable.
Do not ask how much I have spent to get it there though
I would like to get more out of mine and eventually I think I will.
So, I believe that at 1.7....1.8 it can still be streetable..More ??
I wouldn´t be suprised if someone says even 2.? and still be somewhat streetable......
(471" 10.5cr Barton Hemi)
Kimm