i would get it checked, what if its under fueling ? piece of mind imo other wise your engine could go bang. Now i advice to just go o9ut and buy a aem wideband. for £150 it can save your engine and save you future money i.e paying £100 to get fueling checked. Or another option is to,,, get all your mods done then whack the ecu then go tuners. if you buy ecu now whack it in pay £100. then you want more power i.e more boost then you ll have to pay another £100 afterwards. see where im coming from now ? £100 every time you change something. so its worth paying for a wideband.