my buddy is giving me his stock 07 lsj downpipe and cat.the cat on my 07 ss/na sounds shot.its rattling.is it too much trouble to get this to fit on my automatic car?

 

they are the same downpipe and header but just bigger... people do this all the time. good luck

 

I bet your heat shield is what is rattling.....

 

WRONG!
On a manual sure its fine. On an auto no it wont fit and it isnt the same.

The lsj downpipe is shorter and the cat will still hit on your car it will not fit without modification!

Search on here someone posted up a howto/Comparison.

Im running a ZZP downpipe for a manual car on my car and its hitting on the swaybar and it pulled the catback about a half inch forward so the tip is now slightly under the bumper. So in early feb I have to go to the exhaust shop to get the downpipe modified slightly.

I have pictures in my members gallery of the zzp manual 3 inch catted downpipe with the stock auto LE5 downpipe above it. Take a look you can see the differences.

 

True, 07redssna did it the downpipe needs modified because the auto tranny causes the motor sto be slightly titled forward, hence the reason zzp has an option for auto and manual tranny

 

As G85_SS said... your heat shield might be rattling... so I'd check that first.

If it is your Cat that is "rattling" then just drive it a little bit more spiritedly. A couple of WOT trips here and there. What is probably happening in that case, is that the cat's internals are falling out. The WOT trips will blow them loose... I don't know that this will help you though, if you are still on stock cat-back. I'm not sure that the design of the stock cat-back system will still allow them to blow through or if they'll clog up the passage way of the exhaust.

 

Common for them to be confused. I'd be willing to put money that the rear of the heat shield has come loose. (IE rivets popped off) Simple fix.

 

well,i was just on the highway and it sounds bad at wot.something is rattling.when i had my new tires installed i asked the guy to check it and he said something is rattling in the cat.i believe its covered under warranty if the lsj wont fit.

also will using the header from the same car alleviate the problem?

 

I'd just get it changed under warranty then.

 

Exactly...Why go get something used and spend money? Just to take it to the dealer for them to say, "this isn't covered because it's not the downpipe for your car".

 

i know for a fact it is mine blew out 3 months ago it just sucked because the stealership didn't have it in stock so I had to wait 2 weeks for them to get it

 

theres no heatshielding on the actual downpipe.

 

wesg631,yours blew out too?what did it sound like?

 

Uhmm.

rofl!

I had no idea.

 

lol, pretty sure he means on the exhaust manifold..

 

^^^nicest redline ive seen!

 

ok after reading through those other posts the bottomline is this thing wont fit without modification?

 

Thank you, but mine is actually just a 2.2!

 

fine... its the nicest ion.

 

Some cars do so was just making sure.

Hell my zzp downpipe has shielding on its cat.

 

would welding in a magnaflow cat solve the fitment problem?

took it to the dealer,turns out the flange was cracked just before the cat.they are replacing downpipe free of charge.