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bhp increase

  1. [Astra Mk5/H] [04-09] Exhaust System on a 1.7cdti

    Astra, Corsa, Zafira, Meriva, Adam, Agila, Combo
    Hello, I've had my Astra remapped again today on the RR and it's currently at 138bhp and all i've done is de restricted the air box and put a K&N panel filter in there but I'm wanting some more power and a bit more noise. I have no idea where to start with an exhaust system and literally know...
  2. [Vectra C] [02-08] Vectra bhp

    Cavalier, Calibra, Vectra, Signum, Sintra & Insign
    Vectra power increase Is it safe to increase the bhp on my 58 Vectra cdti 150 to 190/200 bhp. Dave linforth