dorifta wrote:also what are the advantages of running aluminium intake pipes over the stock rubber?
Bit of a sound difference.
With NA's the standard pipe is quite small, even the NA8 has a sort of squashed one. NB8A's are quite large and ok IMHO. NB8B's have a funny add on to reduce the intake noise.
I've never seen an intake with a larger pipe than standard made out of platic/rubber, it's easier to buy premade pipes and cut/weld/bend to fit (unless you are making lots of them)