i went on a 2.5 hour trip to see my girlfriend this past weekend and the trip down there was fine. i got there and everything was cool we had lots of fun and my car ran as it always did blah blah blah. on the way back it was like 90+ degrees out and it was almost all freeway back. i was going about 75-80 mph w/ my engine reving at about 3.5k rpm. When i got back into the city i noticed that my car was louder. i can't really tell where the sound is comming from but 3 things that it may be would be the spider gears in the tranny, exhaust leak or blown head gasket. i did a quick look under my car and it didn't look like there was any holes. the exhaust pipe is still silvery (not rusted). its a stock exhaust pipe but i have a 4-2-1 header and cais. i just replaced the gaskets on my header (between the engine and header and between the cat and header) because of a leek. the noise used to be i couldn't hear my engine really until about 3k rpms when my intake starts its noise but i hear it now when its idleing. i don't know if this would matter but when i was at my girlfriends town they have non-reformulated gas and i filled my car with that and i added some fuel system cleaner. the engine seems to run a lot smoother and idles now at about 600. thank you for reading my lengthy explanation and please give me your ideas/comments.

 

well its not the head gasket. if it was that, you would have major problems, not exhaust noise being louder. check your exhaust gaskets etc. would be the only thing i can think of.

 

Yeah.. probably exhaust gasket / rust hole. Cant think of anything else that would cause that

 

think i found the problem......theres a big rust spot on the back left bottom corner of my muffler. couple layers of metal have flaked away so that is probably what it is

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cypher0117 &raquo;</TD></TR><TR><TD CLASS="quote">think i found the problem......theres a big rust spot on the back left bottom corner of my muffler. couple layers of metal have flaked away so that is probably what it is</TD></TR></TABLE>

sounds like to problem right there. just get the muffler replaced or go to the local salvage yard, and pick up a axle back. good luck.