Does anyone know where I can get a 3" bass port trumpet to fit to the standard airport? I want to increase airflow but without too much induction noise. Just been looking here, (Number 4.)

4.) Taz's 3" trumpet mod

I'd imagine any decent online car audio retailer would have it.

Just realised Maplins do them

Any car audio shop mate! Get one, it's great. No noise, some more bhp's!

Sounds like the cheapest way to add a bit of power. Any reason that it won't have a similar effect on the NA? What happens to low end power?

Nothing, to me anyway.

Bought the 3" trumpet yesterday. Will fit it this weekend. Standard trumpet is just over 2". Not expecting much of an increase in performance, but every little helps. Tried the induction kit in the past, (57i), but it was just too noisy for me , (although it did rev easier above 5krpm). Hoping with this mod there will be little increase in induction noice but still allow the car to breath a litte easier. Surely an extra inch in the right place is always a good thing

It actually is the smallest spot before the turbo!

KrispE: Could you take some pics when you install the new trumpet? Kayjeys pics are so small.

Yip will do.

Here's a pic of my bay, it's not very bright or anything but you can see the 4" pipe.
http://sfk.ibk.se/depa/showfile.php?carpic_no=893&type=picture