If you have managed to get yourself an older generation E85 model and you still have some money lying around to spare, you can easily get some serious bang for your buck.

There are quite a few modifications you can do for yourself but there’s also some packages you can get from seriously big names in the industry.

It wasn’t so long ago that German tuner AC Schnitzer were making their ACS4 kit for the E85 BMW Z4 and they weren’t very expensive.

Prices ranged depending on what you wanted to do, they would even make parts for the somewhat rarer coupe version of your car.

In terms of performance, there’s not much to consider. The ACS4 kit only comes with a 3.91 : 1 rear axle ratio and some aero tweaks.

The ratio change improves acceleration at the detriment of top speed whereas the aerodynamics only really work at the higher end.

Perhaps you should focus on the aesthetic bits for your E85 BMW Z4 and think about stuff like wheel and tire setups rather than anything else.

You can have 20 inch alloy wheels, performance tires and, if you really feel like it, a set of upgraded brakes. These are very difficult to justify when there’s no added performance and you’re on a budget.

Either way, an AC Schnitzer BMW will still have presence when it comes to rolling around town, not race tracks.

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Buying an old one of these cars is actually quite accessible and then you’ll have to do something to it so that it keeps up with the new E89 powerhouse.

Who else could you turn to if you wanted more power from your BMW if not German specialist G-Power? Call them up and look into their SK Plus package.

Assuming you’ve got yourself the proper roadster, the 3.0 liter straight six cylinder powered version of the Z4, you can have some extra grunt.

The G-Power SK Plus package is inspired by the sort of engine mods the tuner fits to their infamous Hurricane RR and imply the fitting of a Sporty Drive supercharger system.

What that entices is that the BMW Z4 now has 286 horsepower under its bonnet and 254 lb-ft of torque will pull you along.

That’s a bump of 55, respectively 41, over the standard model. 20 inch light alloy wheels and Michelin sporty tires is what will also contribute to the speed.

The latter will also be helpful to the handling package. Since G-Power also fit an adjustable coilover suspension package, there’s probably no complaints to consider.

An untouched version of the standard chassis will almost certainly handle the power boost, but going from 0 to 62 in just 5.4 seconds is always a good reason to sharpen a car up.

Finally, there’s a few cosmetic bits to consider but even so, G-Power charges as little as 4000 USD for the BMW Z4 package.

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