That's what I did, a gradual process, I'm getting mine mapped again as I now have a nice shiny polished plenum to go on and the airbox mod is now sorted.
I did exhaust and HFCs before I had it mapped the first time and made 15bhp. My 90k mile DE surprised me pulling 281bhp pre map and 296 after. Hopefully with the plenum spacer and air box mod I should see just over 300bhp (Obviously an estimate on true power on the dyno)
I would have done it all sooner but some face lift bi xenon front lights came up at a good price
For an old car 05 I'm pretty impressed with it tbh.
This has been the first car I've modified in 15 years and it's quite addictive, I scoffed at the term Zeditus when first joining the forum but now I'm hooked.
Once the plenum has been done I'm going to concentrate on the overall stance with a decent fast road handling set up and bodywork enhancements to complement the face lift lighting all round.