F-SUPER DUTY
Registered User
Just finished install,Cut Y and welded into 4" straight pipe to 36" magnaflow straight-thru muffler,2-45 degree elbows and out the side in front of wheels.Test drove truck and it seems to have lost little low-end power.This seems odd!From what ive read more is better.Do i need restriction?Any help would be welcome.Truck is an 89' superduty dump,7.3 IDI non-turbo,E4OD,5.33 rear,weighs 9000 lbs empty.