does removing the catalytic converter add HP? Options

[nate95]

Hey i was just wondering if i were to remove the catalytic converter if it would add any horse power? or what about getting a "Y" pipe before the cat. so i can still have the cat. but have it go straight out when i want to race?

[Jmk91]

Yes it makes your car louder, but not that much louder. Way I look at it... Cats only last 20-50k miles for most of them... If you don't need to pass emissions than bypass it. We bypass almost all of ours whenever they fail in my area. Now some sound raspy without a cat some don't it just depends on current exhaust set up. On most of my cars it was prob as loud as going from a factory manifold to a header in terms of how much louder it was. my mr2 I had no cats with stock piping with eBay header. It sounded kinda mean at 4K Rpms. I liked it.

This post has been edited by Jmk91: Feb 15, 2016 - 1:29 AM