http://www.volant.com/3dkls/iddb/Tfile/FILE/intakes/image/VW/411520_lg.jpg
At around £170 they seem to be priced well, add to that shipping and VAT its likely around £240?.
£170?????? $390 is about £240 mate, then you got import tax and delivery
Err not if you buy from here its not
http://www.ebay.co.uk/itm/300613063489?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 That equates to £168.30 and its cheaper if you buy direct, a quick 5 min search on google saw one for $262USD free shipping in USA (shipped to a mate he forwards it on) this cuts out the common "handling charges" and shipping profiteering from US companies (quite common to pay $50 shipping to see a $29 label stuck to box!!, thats one hell of a charge for writing 4 words on a customs label
)
Import tax there is none, only VAT to pay plus any parcelforce charges that may occur (£8.50 or £13.50), sometimes better to ship UPS or fedex as they dont charge that fee (or they did not up until 3 weeks back when I last got a package from USA and paid customs on it!).
Also another tip is to have it shipped in a pre-paid box (which does not state shipping price on it) this way you dont get charged VAT on the postage cost as well, as UK gove charge VAT on both declared value and then add postage cost before calculating VAT, robbers (You still pay VAT on the declared item value whatever that may be!)
If a shop is selling retail at $262USD there are discounts to be had for multi-buys direct from manufacturer, they may even do better deals to have their product on show in UK (Expanding markets and all that!)