hey guys ive just bought me a glanza today it is a lovely car from a kid in devon on the way home it was raining and i went to over take a car booted it it boosted but then it started backfireing and it was like the turbo dropped all boost and then back to normal when i backed off, scince then ive been out in it in the dry and it is still doing it not everytime just wen i really boot it, it seems. im told the car has hybrid ct09 front mount intercooler external waistgate and coupple of other bits and bobs, the turbo and engine both work brilliantly apart from this problem any help? p.s im new