I need the right sized silicone coupler to go from an 85mm MAF to a stock 78mm throttle body. Which size do I need?

 

85 mm converts out to a lil under 3 3/8 inches and 78 mm converts to right at a hair over 3 inches,, I would guess 3 inch would work, just stretch it to fit the maf.

 

That's not going to work. I know that a stock tb is 4 inches outer diameter.

 

3 inch to 3 inch, seen it done many times

 

nope wrong. i just finished putting on a procharger and to go from the stock maf to the stock tb they supplied a 3.5 to 4 inch coupler.

heres a lint to the procharger instruction. http://www.ls1.com/ed/procharger_owners_manual.pdf check page 25 part W

 

???????? I have 4" couplers on my car, and I have a 92 mm throttle body and a 100 mm MAF, and its tight on the maf.

 

85mm is the ID for a truck 5 wire MAF. OD is 4", OD of a stock 78mm TB is also 4". The kicker is the inlet for the truck MAF is 3.8" OD. A 4" rubber coupler will clamp down that far, a 4" silicone will require something in between. I used electrical tape and havent blown it off under boost yet

The stock 3 wire 75mm MAF is 3.5 OD in/out, so you'll need a reducer to fit the stock TB

 

i need one also but it looks like I'am just going to order a replacement from slp. It's $24.

 

Ok so 4 inch on both sides. How long, what angle (i remember hearing 22) and where should I get it?

 

4" x 6" straight silicone hose cut to fit when you get it and see where it needs it. It will bend by itself and you should use clamps to secure it and you will be fine. Go to google and type "intake hoses dot com" *hint*