no chips don't do anything for your car. you have a stock del-sol. chips will only screw up your ecu. delsols come with more than one type of motor. how the hell are they gonna make a chassis specific chip? they're a scam. learn about your car before you mod itits a pcd (performance chip direct) performance chip stage 1 for 80 $. think i'll get much out of it?
no. i/h/e and cams warrant an ecu reflash/tune and that's not heavily modded. and dyno tunes are overrated. a street afr tune will suffice for most street cars not making crazy powerOne more vote of don't touch the ECU unless your car is heavily modified and you want to pay for a full dyno tune.
doing just cams isn't heavy modding depends on the type of cam. a drop in stage 1 cam form skunk2 isn't heavy modding. now if you did full head work like porting, valves, retainers, springs etc. that's heavy moddingI view internal geometry changes like a cam to be a heavy modification of how the engine was intended to operate. You could sleeve the block and put forged pistons and rods in but if you keep to the same CR and bore then you don't need to mess with the pcm. (mind you unless you are doing some other changes that was a waste of time)
Anything that changes your CR or head airflow will warrant a tune but I wouldn't bother with just an IHE.