The power of a Vitesse is stated as 180 bhp
And the Vitesse Sport at 200bhp
0-60 in 7.8 seconds
and 7.3 respectivley
Top speed of 140 mph and 145mph
And for a car that weights 1395 kilos That's not bad at all
For such a big motor it does feel quick in standard form.
Find below other various performance upgrades and prices of the more well known nature.
Motobuild are a Rover specialist performance workshop and are dedicated to Rovers in this country.
You can find em' at http://www.motobuild.com
Or by telephone on 0208 893 4553
They also sell most Rover parts off the shelf New and secondhand i think. If you do want something always check all details first.
Loadsa performance parts can be seen at http://www.needforspeed.co.uk
Also take a look at Barrem motors They specialize in Rover parts too
Go and see them at http://www.barremmotors.co.uk/.
MOTOBULID PRICES DO NOT INCLUDE THE VAT BUT NEED FOR SPEED PRICES DO !!
Turbo Upgrades
Stage 1 turbo power upgrade all fitted by Motobuild will cost you around £225.00
Stage 2 turbo power upgrade all fitted by Motobuild will cost you around £525.00
A quality bleed valve kit can be found at Barrem motors £140.00(or see cheap Turbo upgrade links on this page)
Dump valve kit attached to turbo body from Motobuild £75.00
Dump valve kit with T-piece (fits in intercooler pipe) £98.00
Silicon intercooler pipe kit from Motobuild £175.00
Water injection kit from Motobuild will also cost you £475.00
Exhausts
Complete stainless steel exhaust system 3.5 inch tailpipe from Motobuild £350.00
Anti-cat box for above system from Motobuild £50.00
Mongoose system at Need For Speed will set ya back £337.00 inc anticat.
Mild steel system with twin 3 inch tailpipes from Motobuild around £190.00
Anti-cat box for above system from Motobuild £54.00
Air intaking 
Replacement Green filters from Need For Speed at £38.00
Pipercross replacement filter to go inside normal air box from Motobuild £27.00
Pipercross replacement kit from Motobuild £54.00
Pipercross cone fitted to air intake of turbo.. Around £40.00 You should be able to get this from most performance upgrade shops
and you can make some sort of bracket yourself to help stabilize it.
Fuel and Ignition
Uprated fuel injector set from Motobuild for around £160.00 (exchange).
Uprated ignition HT lead set made by magnecor 8mm £48.00
Uprated ignition Pro HT lead set made by magnecor 8.5mm £56.00
FSE power boost valve from Motobuild will cost ya about £100.00
FSE power boost valve from Need for Speed will cost ya about £95.00
Stopping Power
EBC Kevlar rear brake pads from Motobuild £38.00
Kevlar Red Dot pads can be found at Need For Speed for around the £60.00 mark
Or EBC discs from Need for speed at £60.00 and £70.00
Slotted rear brake discs a pair from Motobuild £132.00
Red Dot vented discs from at Need For Speed £120.00 to £235.00
TarOx discs from Need For Speed at around £160.00
EBC pads rom Need For Speed range from £24.00 to £77.00 depending on pad specs
Goodridge brake line kits at Need For Speed at £67.00
EBC Calipers from need for speed either £56.00 or £124.00
Front vented discs from Motobuild £144.00
Mintex front pads from Motobuild £58.00
Suspension
KONI oil adjustable shocks from Motobuild £280.00
Lowering springs set from Motobuild £110.00
Standard height uprated spring sets £120.00 at Motobuild
Uprated gas shock kit from Motobuild for £220.00
Avo 40mm lowering spring sets from Need For Speed are £93.00
PI 35mm spring kits at Need For Speed will be bought for £109.00
Body
styling
Rear boot spoiler with brake light at need for speed is £79.00
Rear boot spoiler without brake light at need for speed is £112.00
Or then theres Nitrous oxide injection, , Hmmmmm,
Injecting the highly flammable Nitrous oxide into ones combustion chamber can increase power by loads.
Systems are getting cheaper and cheaper and DIY easy fittings are also available.
Click here to get an idea http://www.highpower.freeserve.co.uk/
Let me know if anyone tries it !!!
Upgrades for Rover 800's are few and far between but they are out there. If anyone knows of them hey help us out and send the details to me so i can let the world know.
Bigger tires means better grip...stated pressures should be 32 for normal driving and 36 for over 100 mph.
A slight increase in tyre pressure will improve the handling a bit.
For Other and more performance upgrades Check my link page.