I'm about to order a CFM 67mm throttle body for my ST170 from Pumaspeed but am a little concerned. If I look at the same product from CFM based in America they actually list in the items description :

"Most aftermarket air intakes have 2.75 inch piping while our throttle body has a larger 3 inch opening. You will need in that case a 2.75 inch to 3.0 inch transition hose and the 3 inch hose clamp listed below."

Where as the one advertised in the U.K. doesn't mention this ?

Has anyone fitted one before, and if so do I need the transition hose ? and would I also need a new gasket ?

CFM listing: http://www.c-f-m.com/performancepart...35.htm#details

Pumaspeed listing: http://www.pumaspeed.co.uk/product-F..._453.jsp&pic=2

 

Y would u be changing the throttle body?

 

Look at the bottom of the CMF page they have the hose listed you require

Here:
http://www.c-f-m.com/performancepart...take-p2232.htm

 

A couple of bhp

 

Cheers