Hi there.What to buy a cold air feed to go from fog light cover to the Apexi induction kit on my pre-facelift impreza but don't know what size i should get (60mm or 76mm ID) ?

 

First things first, why do you need it? (plus what year car and what model?)

Tony

 

As big as will go in

 

most cold air feed pipes are 76mm, can be got on ebay, good value

http://stores.ebay.co.uk/MIJ-EXHAUST...=p4634.c0.m322

 

Got a 1993 wrx which i converted my TD05 16g to front entry.76mm it is.Cheers guys.

 

I've never understood the necessity to get cold air into the turbo considering that same air will very shortly be getting expanded exponentially by the turbo itself. Concentrate on the charge air temps and you'll be better off.

 

The colder the air going in the cooler respectively the air will be coming out of the turbo. So the intercooler can cool it down lower.

 

When the air is being heated to well in excess of 100 degrees celsius a couple of degrees drop at the inlet won't make the blindest bit of difference though.