I have to agree with Van Diemen - I've never left a car standard in my life, other than a company Sierra 20 years ago - and it is all part of the petrolhead hobby. We're all car enthusiasts (which is fundamentally why we're here) and we're a dying breed I fear. Too many non-petrol people just wanting to get from A-to-B and willing to let the bureaucrats drive them into automobile mediocrity. These same people will tell you that if mods were that easy, then they'd do them at the factory - WRONG - they want a single spec for as much of the planets buyers as possible. I want a spec for me!
I have a Renaultsport Spider, which is a fantastic car, with a proper race-car designed chassis (lighter than a Panda), that was then compromised by Renault to get it on the road quickly and under all the EU regs. It was strangled to 150bhp and with rock-solid Bilstein suspension that was simply never configured correctly for the car. But with a full set of Ohlins suspension, induction, head, cams and exhaust fettling, it now has 185bhp (150 std), brakes to die-for and a chassis setup that breathes with the road and floats over everything. The car is transformed.
Did similar to the RS6 too - MTM engine and exhaust upgrade (now 540bhp/530torx - gotta love torque!), Bilsteins (ironically) in place of the woeful interconnected DRC hydraulic anti-dive/wallow suspension and set of ceramic brakes. Again, utterly transformed.
I have been too far with cars before though - a perfectly road-able Impreza STi-V (personally imported from Tokyo in 98) morphed into a Nurburging focussed device, to the extent that it was completely rubbish on the road - too hard, too noisy, too baseball-cap-on-backwards - and I sold it on.
And whilst you never get back the money you spend on 'tuning' (although the Spider might be the exception, as there were only 60 in the UK 12 years ago,, so it's appreciating), remember how much you lose when selling to upgrade to the latest whizzbang version. My RS6 has depreciated by about 5x the investment made on tuning, so an upgrade to the new 570bhp V10 version is crazy money. Far better to make the current car faster (it's 300+kg lighter too, so a better PWR) and save the money.
Just my penneth worth. Which is why I am excited about playing around with my Panda 4x4!
Regards,
PhilG