You can, or if you are a cheapskate like me you can modify your manifold for about 30 quid. It's quite easy to do ( I made several expensive cock ups but now I know how to do it, some details are on my web site -
www.deepfolly.co.uk). I would do it a bit different if I was doing it again in that I would use a smaller ali box. It seems to work OK as is though.
Enoch