i did catless dp because i needede the extra air flow for my big spooly boi. if you dont have an exhaust restriction, and you’re not modified its dumb. i had a high flow cat that was still restricting like 100hp worth of airflow so it made sense for me. as somebody who got a high flow cat i can confirm with air mass readings at the MAF before and after that no obstruction flows better than some obstruction.

hard analogy to make. biological systems are so different than mechanical.

the life blood of my car is my paycheck tho.