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Quote: Originally Posted by SimonSJR (original)

1. Alta Air Filter £45

2. Alta Air Diverter.£68 (the new intercooler is prices at £500 + fitting).

3. Alta Air Intake System £205. (supposedly has 10bhp gains on a standard S.

All IMO of course...

1. Too small a gain (if any) to feel.

2. Worthless, some people have posted on NAM that the stock inter cooler is actually pretty good and they doubt gains from after market versions, unless your running high boost.

3. I'd be cautious of this too. It is basically an air filter and silicon pipe, not sure its worth the money.

Also I have run an open filter on my S with the hood scoop open and yes it sounds great, but it actually drives better with the stock filter in the box (I have JCW kit). The car 'recovers' from gear changes much quicker and has more low down torque.

Real power gains can be had by replacing the cat and mapping. Take a look around the R56 section on MINI COOPER :: North American Motoring theres more people doing engine mods there.