quick question, if i get aftermarket exhast, will that reduce the amount of black crap that makes my stock tips so freaking dirty? also, what the hell causes that? too lean/rich? and yes, i did do a search and nothing came up. thanks

 

no you usually get carbon build up on an exhaust. are you catless? How long does it take for there to be a noticeable amount of build up on the exhaust?

Unless your cats are bad or you have a bad o2 sensor its normal. And changing your exhaust wont do anything.

 

solution: clay bar and aluminum polish

 

did it today, it will be dirty in less than a week

 

if it is a bad o2 sensor or cats....is that covered under the powertrain warrenty?

 

most likely yea. but unless your getting cel's or something its just normal. Have you changed anything on the fuel system or even the plugs? If they arent gapped right you might be running rich or maybe you adjusted your fuel pressure too high?


I really think its just normal unless you have a cel and if you do it should be covered under warranty.

 

no light ever. it did it when i first got it, still does it after a spacer/pop charger. ran few tanks of fuel system cleaner. it really only takes like a week. could try the plugs...but could this really be the cause? thanks for all the help

 

I really don't get this whole black residue on the exhaust thing. It's almost as if something has been burnt upstream of the tips and passes through them.

 

if i get aftermarket exhast, will that reduce the amount of black crap that makes my stock tips so freaking dirty? also,

No. The primary component for cleaning is the catalytic converter.

what the hell causes that?

Carbon.

 

Don't worry it's normal. You will see at least a little bit of black residue on any Z or G coupe. Better running just a little rich than lean.
My solution: Titanium tipped muffler. It won't look as bad since it'll blend in lol

 

come to think of it, i have not seen a car yet that does not have some degree of black on the exhaust tips.

 

this is thick and covers the edge of the tips....it looks like i painted them that way. so if it is bad cats....is that covered under the powertrain warrenty?

 

I think what everyone is telling you is this is not bad cats, but perfectly normal. If you are really concerned it is the cats, go have a sniffer test done.