Yes you can BUT it will come at a considerable cost due to needing new holes and other things needed!!!
Not really worth the hassle, trust me, I am in the middle of doing this at the moment. I have just talked to and seen slipper's car and it sounds amazing with the standard 1.6's in it.
FOR SALE...... $22,990
AUII XR8 (200kw), Silhouette, Body Kit, Hawk Wing, 5 Speed man, Premium Brakes, Premium Sound, Genie Extractors, 3" exhaust with twin 3" tips, K & N filter with air scoop, Polished Inlet manifold, MAF & 70mm T/B, T series interior handles & Gear stick ring, Chequer plate, Momo Pedals.