EVERY single extreme car we ever saw at JDM the owner wanted 3.73s. And they did whine right from Saleen. We did lower pulley, (non 08s) 08 front mount, 08 air kit, longtubes, x pipe, dyno tune...they'd fry tires through 4th with the 4.10s. absolutely wicked fun cars.
saleen is also pretty infamous about having shitty customer concern...if your 4.10s whine in your $100,000+ car that's a build one of a couple hundred, they don't care. please hold.
I take that back. the shop vehicle was a 08 extreme (sterling, 1 of 25). and we went 4.56s with that. but that's a dedicated racecar, runs 9.90s and has 37 miles on the odometer. then again, to get technical, it was only assigned a bumper number after the car was completed and being raced. it DOES NOT have the appropriate documentation or riveted tags on the floorboards under the carpet or under the hood - it was shipped to us painted and complete minus motor and trans. it's not a H302 car like it is supposed to be, it's a 5R55S driven by a JDM 298 stroker. So it's technically number 26. But whatever.