Make your own, 70mm 90 degree bend, 70mm joiner, 70mm air filter of your choice, should cost you less then £80 filter depending.
I run the Ktec one and tbh it's a great piece of kit. Yes you could probably make a DIY one cheaper without the heat shield But now that I've seen/fitted the Ktec kit it's a no brainer. Big cone, perfect solid fitting heat shield and it sounds great. I'd recommend paying a little extra. Just my 2p.
Thanks for the reply guys. I did debate making my own but I'm lazy . @odinson, so you literally attached a cone to the intake pipe ? No heat shield or anything ?