- power gains from a catback will be small and a set of headers for a 1mz will be expensive, even if you buy the obx (IMO, junk headers) due to shipping - An ECU tune with little modifications using a piggyback setup will give you minimal gains. - A HD clutch is pointless if you aren't tracking it regularly or willing to put some $$$ forward. A certain Viking like fellow has a Gen4 which has done 225,000km (of which a good portion of them were supercharged ones) on the factory clutch. - As jeffy said, a set of lowering springs, rear sway bar, strut tower brace and good tyres will gain you time in the corners. I would also recommend some Poly bushes for your lower steering rack to sharpen your steering. Remember you have a Camry and unless you pour money into it it isn't going to be a performance machine. Secondly and remember this one, you must apply the 2 of 3 points of the 'Quest for power triangle': - Cheap - Power - Reliable You can get power cheaply, but it won't be reliable. You can have reliable power but it won't be cheap. You can have cheap reliability (ie- like a stock Camry) but she ain't going to be powerful.