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  1. N/A Tuning
    hi I’ve been looking about for which back box (muffler) to get but so far I’ve hit a wall. I’ve a 1.4L Astra h (MK5), I’m looking to spend £100-150, nothing really loud leaving the original silencer on just want something that sounds good. Looked into sportex and hornet but not too confident...
  2. Astra H
    Hello, I have just installed a sportex performance backbox on my astra 1.9 and when reving past 3k revs there is a horrible whistle comming from somewhere that wasn't there before i installed the back box, can someone please tell me what this is?
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