logik23
Legacy Member
sspikey said:Hey logik
if your so smart
WHY a 3" exhaust on an n/a motor?
im curious
arent 3" turbo application exhaust?
Usually, yes, but the KA is a big engine, and big engines need to breathe. a 4-1 header and 3 inch exhaust usually increase top end power, but sacrifice low end torque, but the KA is big enough to keep that low end torque, even though the top end is increased. A 4-2-1 header with 2.5" exhaust will increase torque and top end on a 1.8 or something, but will choke a 2.4liter. Same reason people with V8s put 3" straight pipes on an NA motor.
And before anyone says V8s are twice the size as the KA so that's why they use the 3", you're wrong, a 3" pipe on each side of a 4.6 liter Mustang V8 means a 3" exhaust for each 2.3 liter straight 4.