nothing really, as long as its in good condition, but advised to do a good service, change oil plug etc, if you want better results you can fit a TIP, Cone filter.
but im not the best pearson to ask sure someone will pop along soon
when i spoke to amd i think it was just an uprated panel filter!? stage 2 was downpipe sports cats and cat back, stage 3 was a front mount aswell iirc...
I'd go with RTec Sham, where in Brum are you? Depending on how far you want to go? I recommend you fir a 3" TIP with a cone filter, and it will see you around 260bhp on V-Power fuel.
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