such as...
forge make a large range of inlet pipes for different turbos, but they aint gonna produce inlet pipes for aftermarket turbo because who'd buy them.
so it depends on what car you have, and what turbo is fitted
i.e
ibiza with a k03s upgrade your best off still getting the tip made for the
ibiza, because the k03s isnt much different from the k03. but if you had an AM04/JBS04/k04 turbo then best bet would be buying an S3/LCR inlet pipe
as far as i know, the neuspeed inlet pipes are only made for the k03/k03s