Hi there. Let me say something although I'm no expert.
With chip u getting a standard chip for a specific make and model how it doesn't cater for what the car software is.
With remapp they customize ur car according to your car. Downpipe will help it not put strain.
Maybe Rolf can comment on this but I feel that with software ur car will be fster then with a chip and safer. Also cost is abt the same. Software vs chip. Downpipe is extra cost. I done my car and boy it rocks.