for the tvr?where are talking fitting them?front doors?i dont know of a car to have 8" speakers fitted as standard apart from the sub packs for 350z's etc.what type of speaker you want?comps or co-ax's?id get a set of speakers which have the option of being amped,fit them then if your not happy then buy and amp as you may find your happy without it
vw touareg has 8's in the front doors and the RX8. Not that its relevant but hey!