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Catback Exhaust, exhaust manifold w/ high flow cat, and ECU remapping. If you wanna get crazy, cylinder head port and polishing and building a bottom end.
I think suspension is a good way to make your Cooper feel faster! It transformed my car!!!
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Koni yellows, H-sport springs, H-sport rear control arms, powerflex front control arm bushings, OMP lower front strut brace, Ireland fixed camber plates, Alta 22mm rear sway, Colbolt carbon fiber rear strut bar, 15x6.5 Rota group N's (12 lbs), 205/50/15 Bfgoodrich G-force Sport tires, Magnaflow cat-back, intake filter, Spec stage 1 clutch, Powerflex upper and lower motor mounts...MORE!! IT'S JUSTACOOPER!!
One of the good intakes (like this: http://ddmworks.com/MiniStore/mini_c...ni_intake.html)
a decent cat back (read more here: http://northamericanmotoring.com/for...d.php?t=134863) and possibly if you want the most, a header (with cat if your state requires it and you don't want the CEL on) and an ECU re-map. The ECU isn't required but it will make the best out of what you have. Along the way, little things like fresh plugs if they haven't been done, wires, and a good coil will aid evetything. Otherwise, it's a cam swap and head work an that means $$$ followed by a definite ECU.
Catback Exhaust, exhaust manifold w/ high flow cat, and ECU remapping. If you wanna get crazy, cylinder head port and polishing and building a bottom end.
Not really much need to do anything to the bottom end on these cars. You're not going to be making enough power to break anything .
If you wanna get crazy, cylinder head port and polishing and building a bottom end. 
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