afternoon everyone, im new at tuning the B18C4 engine so far ive bought new hd leads and NGK spark plugs ive also put Mobil 1 oil in, which has all helped up the horse power a bit. i need to know how much the standard B18C4 engine can take. ( maximum BHP without upgrading pistons etc.) and without spending to much for now, and can anyone point me into the right direction on what is out there to upgrade my engine, also im from North Wales does anyone know where the nearest rolling road is.