I am planning on doing my whole exhaust system. Before I do, I wanted everybody's opinion. Disreguarding emissions, is there a big difference between Hi-Flow cat and straight pipe? Will I see that much of a difference between the two(HP/TQ; Spool; sound; etc.)? Please give me your honest opinion. Thank you for your time.

 

Well if your not concered about emissions then go for the straight pipe. As far as sound goes, it does sound louder. There is a differeance between a Hi flow and a straight pipe. I dont know how big but I did a test for my self. I installed a Hi flow cat and did a run. Then I took out the hi flow cat and installed my straight pipe. It was a good enough feel in power to leave it with my staight pipe. Its all up to you, really.

 

Maybe 9 -15hp not sure on TQ- depends if you compare it to stock or HF cat.