add 0. in front and you might be getting close!
But who really cleans those sort of filters? I've had a go and what a faff!
I'm no longer convinced by mild tuning like exhausts, matched inlets and ECU programming (unless it's major tuning changes like camshafts and rebores). I'd rather spend the money on fuel, tyres, brake pads and on track days.
I'm inclined to agree, my Trophy has a remap, maxogen induction, decat exhaust and to be honest can't really tell that much difference at all.
Now when I used to own a Cooper S and had that tuned with a smaller pully larger intercooler exhaust etc and your adding like 50bhp boy you can tell
Turbo'd engine = worth doing IMO