Few questions I can't find answers to
 

I have a 93 240sx hatch and the previous owner put a N1 style exhaust. Right now I have a exhaust leak in the resonator. Looks like someone took a knife and made a hole straight in the middle. Could this cause bad MPG or something else? Its been there for quite a few now. I'm also wanting to replace my 02 sensor after getting that hole fixed. My knock sensor went out as well. Replacing that this week. I looked around and couldn't find the causes of a exhaust leak in the resonator. Anyone know? Thank you!

Sent from my Samsung Galaxy S4

Pretty sure the only problem you'll have if the leak is after the cat is unwanted/wanted increase in exhaust sound. As for the cause of the leak... Bad welds, low car big speed bumps, previous owner wanted to try to make the car sound like a 1jz.

Sounds just like a 1JZ haha. I'm gonna get it welded up again so that it doesn't smell so strong. Just wondering if that made it bad. I guess its just the knock sensor which I'm replacing this week. Thanks

Sent from my Samsung Galaxy S4

It was a joke but hey I'll take your word for it hahaha.

No I'm being dead serious :o not as loud I'm not going to be that kind of guy lol but it has a very similar sound when its next to a car, truck or wall

Sent from my Samsung Galaxy S4