I don't know. I never drop an AW4 pan. I only drain and refill just as it was designed for.

 

well my question is why is it a problem for clearance if that crush section is really for epa standards.....other than the fact that it's for both clearance and epa standards.....so those jeep engineers hi-fived eachother for hitting two birds with one stone.....more like whacking the exhaust with a stone and call it a day haha. anyway thanks for the info.

would like to see if I candy reroute the pipe myself. make it easy not having to bother with the exhaust shops around here.

 

The crush is for EPA standards. They disguised it to look like it was for driveshaft clearance.

 

I thought I flexed into it and dented it. Lol. Learn something new everyday.

 

You didn't do it. The engineers had ya fooled, huh?

 

What EPA standard does it help meet exactly?

 

Heating up the catalytic converter so it works more quickly.

 

well if it was only "disguised" as a clearance issue I wouldn't need to reroute the pipe......so what I'm saying that it is for clearance also....

 

What would be interesting is to see the "engineering/thinking" that went into "placing a restriction ahead of the cat will make the cat heat up faster". Seems like things ahead of a exhaust restriction would heat up faster and things after would heat up slower.

 

Disguised by routing it where they did, with the crush. Fooled you, didn't it?

 

Slowing down the exhaust flow heats it up. They also had a lesser "crush" before the converter where the pipe goes over the crossmember.

 

so buy removing the kink,,, the exhaust will run cooler? then my emissions will go up? just curious about that...

 

I sort of wondered about that myself. If it actually has an effect on the numbers, presumably hydrocarbons, I suppose they should go up without it. That's a tough pill to swallow! I suppose if there is a non-CA/epa pipe available, there must be something to it though.

HC's are just unburnt fuel. Some from the space above the top ring and the top of the piston, some from a thin layer right against metal that isn't as hot. The "air pumps" in the old days were to provide oxygen into the exhaust so it could burn.

 

It will heat up, just not as fast as the EPA wanted it to for their test.

 

Ok that's good news... Is there a Renix header then? And then I can upgrade the down pipe at the same time? To 2.50?