Get the HID/ LED modern headlight look with 5000k Philips Diamond vision bulbs. They do not improve the light output but provide a nice white light which looks good. They are more for style rather than extreme vision although they are still ok in dark. Note they are not marked for legal road use though.
Sorted out a blocked DPF on an Insignia. Saved me £££.
Bought this on recommendation from a Vauxhall Specialist as the Insignia CDTi was suffering blocked DPF with the message 'Cleaning Exhaust Filter Must Continue Driving' warning on the dash for over a week. The car failed a forced regen so it was looking like DPF was totally past it. The DPF Doctor was sprayed into the DPF as far as the nozzle would go. Remove the O2 sensor at top of the DPF and spray it into the hole when the engine is stone cold. Leave it for a few hours, put it back together and start the car. It was a little hesitant to start at first and smoked a fair bit on idle. Drive the car and clear any codes it may have as you'll probably have limp mode. Ensure over quarter of tank of fuel and give it a good run. Problem solved and potentially costly January no longer a worry.