http://www.uk-polos.net/
Hope this helps!
(Some of the info has been copied from the FAQ!
List Of Common Modificatins (And Links To DIY Guides)
Get Mk5 6n2 rear lights. viewtopic.php?f=10&t=9117
Get clear side repeaters. (See the standard Driver's Logbook, which details how to do this.)
Get clear front indicators. viewtopic.php?f=10&t=2148
Get a stubby aerial.
De-badge.
De-bump strip. viewtopic.php?f=10&t=36056
Get a Mk5 steering wheel? viewtopic.php?f=10&t=42733
New speakers, head unit, and subwoofer, etc.
Badgeless front grille?
Replace the handbrake? viewtopic.php?f=10&t=42369
De-rear wiper? http://premium1.uploadit.org/ollieryan/ ... emoval.pdf
Footwell lighting?
New pedals, perhaps from an Audi TT?
Change the gear stick? viewtopic.php?f=10&t=319
Replace door pins? viewtopic.php?f=10&t=36504
Replace the seats? viewtopic.php?f=10&t=42268
Change the instrument cluster? viewtopic.php?f=10&t=20428
Window tinting?
Fit a VW Passat interior light?
Replace driver's grab handle for a sunglasses holder?
Wheels and Suspension
Wheel Sizes
The stock wheels were either 175-65-13's (base model), or 185-55-14's (16v), or 195-45-15's. Similar (or nearly equal) in diameter is 195-40-16", which of course was not an OE wheel size. This means that if you stick to these sizes, you're good to go. Aim for an offset of 35 - 43. Any other sizes means you're more likely to run into trouble. The Mk4 is prone to rubbing if the diameter is increased even slightly, for instance if you're fitting 195-45-16 wheels and tyres, instead of the correct height of 40. This is also the case, if you're running 195-50-15's instead of 45-series. Get the right size, you'll be glad you did.
Smaller, wide wheels are popular too. For instance, 195-45-14 looks small and wide, but if the car is lowered enough, it has that cool rollerskate look to it. Keep an eye on the ET though, even small wheels rub if they're poking out enough.
Suspension
The base Mk4 came with oil filled shocks, while the 16v and GTI were blessed with uprated gas filled shocks and slightly shorter springs. Still, Polo's look like they're afraid of the pavement, so lowering the car will improve the look of your motor tremendously.
As with most mods, buying cheap means buying twice. With suspension mods especially, you get what you pay for. My advice: do it right the first time. There are several options to meet your budget.
1. Replacing the springs. If you buy shorter springs the car will sit lower. Fair enough, but the standard shocks you're using are not meant to work with the shorter springs. Hence, the maximum ammount of lowering is limited to 30 - 40 mm. Even then, the shocks will not last as long as they would otherwise, and the ride and handling may be poor.
2. Replacing the springs and shocks. If you get a kit that has the shocks matched to the springs, you'll be getting a significant improvement over the first option. The dampers will be able to cope with the shorter springs, and, since they're uprated, will handle better than the stock shocks. Drop can be anywhere from 30 - 60 mm.
3. Getting coilovers. A must have for show cars, or true tarmac fetishists. I'll try to explain these. Okay, you've seen regular springs and shock absorbers, right? They're completely seperate and you can replace the springs with shorter ones if you wish. That's about all you can do to adjust the height of the car.
Now for coilovers, they are springs and shocks too, but the springs are much more compactly rolled around the shock. Also, they come fully assembeld whereas regular shocks and springs need assembling. The real benefit of coilovers, however, is in their adjustablility: With regular McPherson shock absorbers, the spring seat at the lower part of the shock is fixed in place. On coilovers, the spring seat is not static, but, using a hook like tool, you can turn the seat so it sits higher or lower. This in turn, makes the spring sit higher or lower, which makes the car higher or lower. They are most known for being able to go really low (up to -140 mm on some cars).
Performance Modifications
There is always the option of getting straight through exhausts, performance air filters and induction kits, new manifolds, strut braces, so on and so forth. However, especially on the 1L, this is probably a waste of money, which could be saved to buy a car with a bigger engine in the future, such as a Polo GTi.
Other Notes
Go down to a local scrap yard if you want to replace the damaged body work, find any spares and parts, and so on!