Like It says.

 

Are you using just one of the stockers up front?

 

For now yes. This is just a temporary setup for some R&D that I want to do for a stock FMIC conversion "kit" I want to make/sell on here.

 

Try some searching there was a post from not to long ago which had some guestimated numbers about the pressure drop. But if you just think about it rationally youll realize that putting more piping on an already ineffecient IC is probably not a good idea. Not saying dont do it just saying make sure you keep an eye on those intake temps As far as a good size for piping just stay with the size of the outlets on the IC which are like 2.5in iirc.

 

The stock IC is far from inefficient, its just the placement of it that defeats the purpose. I wouldnt use it for 300+ HP or anything, but it does work pretty damn well to a certain point.

 

i would use whatever diameter the inlet and outlet is on the intercooler. Isn't it 2"?

 

I think the inlet is 1 3/4 and the outlet is 2"

 

I'll check the S5's inlet/outlet dia. I got one outside. I think the dia. are different on an S4 IC. :/

 

try and keep it the same as what the inlet and out lets on either side are.

ie if fron tis 1 3/4 the us the same on the front side and the back being 2 " use 2" on the back side.

 

Do not use pipes the same diameter as the stock connections! When using longer pipes you must make them bigger as well, or you'll dramatically increase the pressure drop through them. This is particularly important if you ever plan to replace the stock IC with a bigger one. Personally I'd use 2.5" or 2.25" pipes, but definitely not 2". Either use reducing connectors on the stock connections, or even better, get bigger connections welded on.

 

The stock IC is aluminum I take it correct? Gotta find me a TIG welder with some skill