Hello-

I was wondering what people have done to get more air to their motors. I have a speed density 410 SBC with a 58 MM trottle body and a TPIS Mini-Ram. When I hit 5300-6200 rpm I think my 3" intake pipe that replaced my MAF sensor is restrinting flow. When I run a straight filter from K & N in front of the intake without any pipes my rpms are higher and my motor will go lean so that I can add more fuel. With the 3" pipe the motor funs at 12.8 A/F and runs out of steam. I do not like this setup because I am getting heated air into the system. What have people done for plumbing. When I run the numbers 58 X 2 = 116 MM total = 4.56". The stock intake is 4" at the clamp and 3" at the MAF. Has anyone modified this to support 4.5" tubing and if so. What type of tubing did you use.

 

first your math is wrong, a 58mm circlular blade on your thottle body has an area of 4.1 sq inches x 2=8.2 sq inches for that dual throttle body.
a 3" tube would have slightly less than 7.08 sq inches, so yes a 3" pipe is a slight restriction,
a 3.5" would be at slightly less than 9.64 sq inches(the best match)
a 4" tube would have slightly less than 12.58 sq inches of area more than enough flow.
the M.A.F. is the biggest restriction, while the throttle body can flow reasonable flow numbers the M.A.F. is severly limited in comparison