saboteur wrote::
You will need two 2.25" to 2" reducers and clamps to suit.
You'll also need to fabricate a couple of top brackets to support the intercooler - aluminium brackets are sufficient and simple enough to make. The lower hose reducer connections give it plenty of support.
There's a good write-up here: http://www.mazda-speed.com/forum2/index.php/topic,25097.0.html
I'd recommend buying or borrowing a reciprocating saw for cutting the OEM intercooler pipes. I used a hacksaw and it took forever - I then spent ages filing the pipes straight since my cuts weren't perfectly square.
This is a reasonably big job but it's not rocket science and anyone should be able to do it - it'll save you around $400-500 if you buy the eBay intercooler, hose reducers, clamps and aluminium and fit it yourself.
