Build Thread Mustang5L5's Build Thread -

I think i've actually decided to put some more miles on the 3.73's before making a decision. I did put some miles on the car last summer, but not enough to make a proper assessment.

So for now, the 3.73's will stay until I can put a few hundred on and see how drivability is and such.

Yeah, that's the plan. garage is attached to the house so fumes make their way in.

Plan was to work on the exhaust and then do some clean-up and paint and then roll it out into the driveway and open it up and drain it. We've had a mild winter. Other than that one -13 degree day a couple weeks ago, it's been consistent 40's and 50's. Plenty warm for outside work.


Tailpipes and clamps arrive tomorrow. I'd like to get one side mocked up this weekend to see if my plan is going to work.

Tailpipes showed up. I think this will work nicely. New flowmaster tails match the old ones, so it should fit well




Going to try out this style hanger. Going to clamp it on the muffler at the base just for support. I have a lap style clamp for the main sealing.



Unfortunately wasn’t thrilled about the clamp I got for th flow tubes. Ordered two different clamps to try but they should be here next week.

I still intend to hang this on the car and see how it fits. Helps using the flowmaster setup as a reference.

Yeah, universal mufflers means to run into issues like this. Got the pass side mocked up. Unfortunately looks like I’m a tad short.

I estimate a 4” extension peice will get me where I need. Fortunately they make those. So more parts on order, and more clamps.

Would have preferred it alll fit one shot but if this is the only tweak I need to make I’m ok with it. Tempted to weld up an extension on the flow tubes….

Going to mock the drivers side up next.

Same issue with drivers side. I found a few SS 4” extensions so I’ll order those up. Stay tuned.

I also need to make sure I leave enough clearance for the driveshaft. It’s easy doing the exhaust now with no rear or driveshaft, but it also means I can’t tighten everything down until I can do final sanity check for fit.




Found the flowmasters are rusted out inside. Can hear the bits of rust flopping around internally when I rotate it. So those are not going back kn the car regardless. I’ll likely chop the tips off and save those.


Parts in the mail. Wait we must.

The only other brand of flow tubes I see is the LMR brand. I can certainly ask them the question as to how long they are compared to the pypes brand.

Edit: looks like they are aluminized steel. Would prefer sticking with SS

I agree the mufflers need to come back so the extension peice I was going to use would likely go on the flow tubes to push those back a bit.

I was also debating just finding a SS exhaust hanger and welding it to the muffler. I have SS wire for the MIG but just trying to avoid using the welder. At least with clamps I can move and adjust a bit before synching it all down once rear and panhard bar go in.

Yeah, I definitely realize this. I cannot move the tailpipes front to rear at all. They are sort of fixed in one spot due to how they tuck up near the frame rails.

I have to move the mufflers back into the tailpipes, or extend.

After thinking about it a bit, I just might buy a peice of 2.5” SS exhaust tubing and weld on the extensions myself. I’ll still use the four exhaust clamps on the muffler itself, but seeing as the muffler needs to sit in the right spot, I think I might need to break out the welder.

I’ll likely weld on some hangers as well rather than use those janky hangers. It’s getting too busy under there with hangers and extensions and such.

Gonna think about this a bit, but you are right. I have the time and space to work so let’s do this right.