Foot_Long90 wrote: Is it worth putting an icu chip in ......?
NO! They are just smoke and mirror stuff.
A proper tune involves a number of things.
First up your tuner must have the software to modify the Mazda ECU, EcuTek was the system used to modify mine. Personally I wouldn’t go anywhere near a tuner who hasn’t worked on a NC before.
The tuner should save your standard tune into his system, just encase you require it to be reloaded at some later stage, ie should you go back to a standard exhaust system.
Then if he’s done a few NC’s previously he should have a base map with a tune for the headers that he can download into your ECU.
After the download it’s onto the dyno where they will do a few pulls to establish the output and to look at the air fuel ratio through the rev range. After this the tuner will modify the AFR where it is required and then download this new file and run it on the dyno again to see the result. Following this or maybe in conjunction with the AFR changes, he will look at the timing, maybe play with that a little and then do another download to your ECU, do another dyno run and check the final output.
As for the cost, remember you are paying for a licence for the tuning software, which isn’t cheap. Then you have the hours the tuner spends working on your tune and the dyno usage, so it doesn’t take long to start racking up the dollars.
So how much will you gain power wise? It varies car to car but probably about 4 - 5 kW.
When you say you fitted a pod filter, if it’s under the bonnet you have lost power, if it’s a Mazdaspeed / AEG CAI or similar you may only get 0.5kW improvement on the stock system. I would be very careful with these CAI's because with the low intake height you can suck water and get hydrolock.