Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
I think they should be a little cheaper than £90. And while what people say about the heat issue is true I got a 14.1 1/4mile running (amongst other mods) a piperx cone filter with no cold air feed so it works both ways imo...they don't add much performance but they also do take much away either.
Plus the RS's sound great with a filter (this was a BMC sealed one with no cold air feed)
The gain from cold feed on an NA inline 4 is 'minimal'. The most important thing is your plenum/inlet pressure and i wouldnt lose any sleep over this 'heatsoak' people talk about! At cruisin and high speeds the hot air under the bonnet is constantly being lost and replaced with cooler air through the front vents.