I have a pair of 5" JBL drivers in my rear quarters. I wouldn't go for anything larger if using the OEM bracket. I had to drill two more holes in the mounting bracket to give enough clearance from the wheel arch (see photo). NB you must have a way of holding the speaker cone away from the interior trim - I did this by mounting the blastic "rim" that the grill is meant to snap in to. I picked these speakers for three reasons: 1) the magnet was only fractinally different in diameter from the original speaker 2) The cone was the same height (length?) as the original speaker and 3) it was the only set in the shop. (Or I'd have gone for a decent full range cone). Don't expect them to sound great - there's no enclosure to reinforce the cone and even with a Kenwood head unit and those JBLs (which I've used before) the bass response is terrible. Here's a pic. Yes, everything's covered in Dynamat Extreme. http://www.delorean.co.uk/pictures/DSCN0519_640.jpg Martin #1458 #4426 --- Soma576@xxxx wrote: >List, > >i am interested in getting rid of those terrible 4x10's and putting something >half-decent back there. what is the biggest possible speaker that will fit >in the hole w/o modifying the trim that goes over it? i don't mind making a >plate or brackets. > >4" round? 5.25"? 5x7? 6x9? 6" round? > >Soma576@xxxx >1982 DeLorean DMC-12 VIN#11596 >Fargo, ND 58102 -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .