Yes they are tricky to fit, make sure you take the usual antistatic precautions. I would stick with the std air filter. I got the full Promax kit:- middle box, chip, K&N and plugs. Didn't like the plugs or filter from previous experience but the chip and box feel better, perhaps a bit like the SE version. Feels a bit smoother in the mid range and torque better especially noticeable in 3rd gear. If you've ever built a PC it's a piece of cake.
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