80% of your posts are total tripe, as they are mostly replies to sh1te posts created by the morons that, unfortunately this forum attracts.
i could keep going, but if you have narrowed down a 20k budget for a LARGE engined motor to those 2 then i am afraid you are blinkered 4k change for ya fuel billhttp://www.autotrader.co.uk/classified/advert/201124391402108/sort/priceasc/usedcars/price-from/16000/price-to/22500/engine-size-cars/4l_to_4-9l/make/maserati/radius/1500/page/1/postcode/ox106ns?logcode=p
... it's turned into a fashion show for poofters.
theres so MCU more than a drag audi or a RS again, what more noise do you need http://www.autotrader.co.uk/classified/advert/201128401994951/sort/priceasc/usedcars/engine-size-cars/4l_to_4-9l/price-from/16000/price-to/22500/make/ford/page/1/radius/1500/postcode/ox106ns?logcode=p
But for the purest engine experience, displacement has no replacement. All other methods are simply attempts to artificially recreate the benefits of displacement.