You have to be careful as a lot of things on construction and use dont come under MoT. People need to remember that MoT is only the minimum basic assessment of key "roadworthyness" factors.
People building trackday cars etc are best to read up on IVA testing criteria as it is based on much of the construction and use regulations but limited for none mass produced cars, kit cars and rebuild/radically altered cars.
Most moderately modified cars would in a legal sense these days probably be classed as a Radically Altered Vehicle in VOSA's eyes and thus should be IVA'd.
Its something that WILL come back to bite the modified scene in the next few years. It is illogical to make it so you have to IVA a kit car but not a road car rebuilt with mostly modified parts.
Weve just been able to get away with it for as long as we have by luck really and people not being too stupid. However as per usual in this country, the mongs have ruined it for the rest of us and the idiot chav racers and VW "scene" faggots with bodged and dangerous mods have drawn unwanted attention to our scene and its only a matter of time before the pressure to enforce the current legislation becomes strong enough.
yes thats right for those who arent already aware, many highly modified cars are illegally on the road and under current legislation should have been IVA'd already. The legislation is already in place (and has been since SVA was introduced) its just that only a few VOSA officials and cops have the knowledge and motivation to enforce it. They have already proposed many changes to MoT to combat it and we are lucky that only a few have got through due to problems with implemention and practicality of enforcing it on a large scale.
Although i suspect when it does come it will be quite simple to refuse an MoT until a IVA test pass has been issued. Probably using the same means they use to catch out kit cars still running on the donor ID.
To be fair i see forced IVA on modified cars as a good thing. based on a type approved road car, almost all the standard bits and areas will already meet the standards anyway so its just the modifications and much of the common mods wont be a problem anyway. It also removes the grey areas often encountered with modified cars. prime example is exhaust noise which is open to interpretation. Under IVA the noise limit is absolute, plain and clear and its easy for us to comply and then no copper can challenge it either (well he can but wont win).