Ed_C
Senior Member
'07 GX470...but it's a 120 chassis like the 4th-gen :happy: In the midst of replacing the main muffler section of the exhaust. It developed a leak a while ago at the inlet pipe, small rusted out area where a heat shield was welded on. I planned to just unbolt it from the Y and weld the hole shut but last week it got noisier and discovered the outlet pipe of the muffler broke off 
Parts List:
- Walker Quiet-Flow exhaust from Summit Racing's ebay store, had a 10% discount code so it was cheaper (and quicker shipping) than Rock Auto and everywhere else
- Gaskets for both ends of the exhaust. 20% discount code plus another $5 off through Advance Auto's points program
- Nuts and bolts from my box of assorted hardware
The original spring bolts broke when I started removing them; luckily the threaded areas where these bolts go into at the Y-pipe are pretty much just tack-welded nuts that were practically just nubs of rust that disintegrated once I started turning the bolts. I just ran a unibit through the holes to clean them up, took barely a minute.
I had to lower the spare tire to get enough room to take the muffler outlet pipe + tailpipe section off. Spent about 15 minutes with a angle grinder to get the bolts off holding the muffler pipe to the tailpipe, way too rusted to get a socket on them. Sections of the flange also rusted away but it appears there's enough of it left to seal (will put some high-temp silicone to be on the safe side).
Was already getting dark (and cold) so I brought the new muffler indoors to apply heat-resistant paint on the hangers, pipes, and flanges since those pieces aren't stainless like the muffler.
Parts List:
- Walker Quiet-Flow exhaust from Summit Racing's ebay store, had a 10% discount code so it was cheaper (and quicker shipping) than Rock Auto and everywhere else
- Gaskets for both ends of the exhaust. 20% discount code plus another $5 off through Advance Auto's points program
- Nuts and bolts from my box of assorted hardware
The original spring bolts broke when I started removing them; luckily the threaded areas where these bolts go into at the Y-pipe are pretty much just tack-welded nuts that were practically just nubs of rust that disintegrated once I started turning the bolts. I just ran a unibit through the holes to clean them up, took barely a minute.
I had to lower the spare tire to get enough room to take the muffler outlet pipe + tailpipe section off. Spent about 15 minutes with a angle grinder to get the bolts off holding the muffler pipe to the tailpipe, way too rusted to get a socket on them. Sections of the flange also rusted away but it appears there's enough of it left to seal (will put some high-temp silicone to be on the safe side).
Was already getting dark (and cold) so I brought the new muffler indoors to apply heat-resistant paint on the hangers, pipes, and flanges since those pieces aren't stainless like the muffler.
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