Performance comparison high flow or resonator?
I'm planning on putting a high flow cat w/ my headers-exhaust set up.
1. What's a good brand for high flow cat?
2. Also, I am running a 2.5 inch exhaust w/ Cosworth header, and will it be better to run a 3inch cat or 2.5" cat?
3. Which is more restrictive a resonator or high flow?
4. Which one will make the car quieter?