So i have decided to go Ebay FMIC, but i need to find out what size i need.

Will have it for a bit with the stock k03, but will eventually move to GT28RS

Want it to fit in stock bumper with minimal/no cutting.

Also, i have heard 2.5" piping is the smallest i can go for Big turbo, is that right?

If you want minimum cutting, then a ebay kit isnt for you. Also you would need a rather large core to cool as efficiently as a denser core. 2.25 would be plenty big for piping on a gt28rs.

what was it, like 2.25" for no cutting?

you can only fit a 2' think core behind the stock bumper...and like cincy said 2.25' piping is plenty for a 28rs. i run an ebay fmic with my setup no problem

so a 2" thick one fits behind tbhe bumper? what other dimensions do i have to worry about? and do i have to get kit for a denser core?

You can buy a denser core, they will cost in the $300-500 range. And the only cores you are going to find that are 2" wide are tube and fin. They are great for preventing pressure drop and being able to make it thinner while still being effective. So basically you will have to do some trimming, how much depends on the width of the core.

hmmm okay. so i guess it jsut comes down to me getting the width and height down and get all the tubing.

with alot of work you can make it fit, but just take your time get go as small as you can go. thats my advice from when i did it

Haha well the whole point of this is to find what the smallest i can go is. i get the 2" depth, but i dont know what width and height i can go with.

Have you guys seen this one on Ebay.com
http://cgi.ebay.com/ebaymotors/AUDI-...spagenameZWDVW

They also have this for B6s.