To me, there's nothing like the rumbly sound of a V8. Again, to me - IMHO, it sounds much better to my ear than the nervous*high strung sound of the LFA or other exotic automobiles. But, then again, I've always felt that way. When I was young and rode a motorcycle, it was a Harley Davidson. I guess I'm not alone because Harley patented the offset crankshaft mechanics that went to create that unique Harley sound.
IMO, the ISF sounds just perfect. Mine has a slightly modified sound due to my exhaust mod. I luv it.
Edit - just to add, I'm also a BIG NASCAR fan, and I have no love for open wheel racing. I'm sure the sound experience has a little to do with that. Last year I went to Kannapolis, North Carolina to visit an old friend. This town just happens to be in the heart of NASCAR country. To me, there is no sound like that of a Cup Car firing up. The ground rumbles and well, to me that sound is beautiful.
And yea, you can't make a silk purse out of a sow's ear, just like you can't make a torquey V8 with 371 lb. feet of torque at 5200 RPM sound like a bumble bee V10 with 354 ft. lb. of torque at 6800 RPM. But, again, IMHO, why would you want too?
Lou