exhaust question

has anyone hollowed out there catalytic converter? do you see any hp gain? or have and sound clips what it sounds like?

 

OK or a high flow cat?

 

I think the stock cats that we have are already high flow.

 

I doubt the gain would be worth the cost. Super charger or turbo charger is about the only mod that will gain you a big change in a 4 banger.

 

I would get a header before I did that.

I have a LCE one and it added HP and made it sound good.

 

been looking at a header and hollowing out the cat. i think i will get some decent HP.

 

I did a new K&N intake and header with high flow muffler and it was significant HP gains. Probably around 15-25 HP.

 

How did you measure the gain?

 

The K&N is about 5 HP gain and the header with muffler at least 10 HP or more. So easily a 15 HP gain.

It is very noticeable.

I measured with me hammering down. It takes off after all of that....

I could blow my brothers 4 Runner that had a V6 0-60 after all the changes.

Before that he would beat me easily.

The 2.7L is about 150 HP and the 3.4 4Runner is about 183 HP.