The Stock pipe going into and out of the stock cats is 2.5 (?) or 2.25 (?), What would be the best way to increase the pipe diameter to as close to 3" as possible?

 

They make those couplers that go up in size but they also make a tool to expand the pipe to a certain size.

 

What are you planning?

 

Im putting the LTs on tonight, and I will be keeping the cats. Now to make things as least restrictive as possible, I do not want to go from a 3" pipe to a 2.5" pipe and back to a 3" pipe. So If I can expand the inlet and outlet of the cat to as close to 3" as possible it should get rid of the bottleneck... I think.

Im really trying to not use a 3" to 2.5" coupling though as that will move it further back than I would want it to be.

Its going to be a really long night tonight....

 

Best option, buy a some magnaflow cats that are the right size.

 

Maganaflow cats are on back order til mid november. Already checked. Stock cats are going back on for now.

I found a pipe expander over at harbor freight for 12.99 so Im going to make a few phone calls and see is any of them around here have some.

 

How about just clamping it all on without the cats for a couple weeks then when the cats come in, stick them on and weld it up.

 

Thought about it, and may do that if it doesn't look like I can expand the stockers any as a last ditch effort. Plus it will save about $180 to do it this way and I wont be wasting anything.

 

if you have to go down to 2.5/2.25 in the cats having an extra few inches of 2.5/2.25 before and after them won't hurt anything. The most restriction will come from the cats, so IMO opinion going the same diameter out for a little won't hurt much more. I wonder what hammer did

 

I don't know what your skill set is, and I don't exactly know what the interior of the cat looks like, but you could cut the inlet and outlet of the cat off and just weld the the new pipe to it. You'd have to cut a little of the cat out so the bigger pipe would fit in. I haven't really looked at mine closely (which are stock) but from what I remember is it's just a 2.5" pipe that's seam welded to the body of the cat. Just cut it off with a sawzall and weld new pipe in.