Flowmaster U-Fit Dual Kit - Making It Fit - Tech

Once you've got your mufflers located and attached behind the X-pipe you'll want to locate a pair of elbows that'll exit the rear of the mufflers and begin the transition upward that will run up and over the rearend assembly. Here you can see the lefthand muffler in place, attached to the intermediate pipe at the right and with the elbow pointing upward in front of the rear axle tube.

Duplicate the procedure for the right side and you'll be ready to take the next step in the process.

This would be a good time to stop and take a couple of measurements to make sure things are lined up and even from one side to the other and that the system isn't hanging too low underneath the car. If everything is cool, you can proceed. If not, make any adjustments needed before you do.

The over-the-rear pipes come next. Slide one onto each of the muffler outlets and rotate them so that they miss any obstructions and so there is ample room between them and the axle tubes (so there will be no contact when the suspension travels).

Once you have them where you want them, you can either clamp them or use a couple of tack welds to hold them in place.

It's important at this point to make sure you've got both the left and right pipes in the same position. Take the time to take a few measurements so that they're as close to the same as possible-if not you're gonna have a heck of a time getting the tailpipes to exit at the same location and it will end up looking pretty funny from behind.

With the mufflers and the initial over-the-rear pipes in place now's a good time to locate and install a couple of hangers for support. In this case there was a crossmember just forward of the rearend that made a perfect point for a pair of hangers to be located right at the outlets of the mufflers.

Next came the tailpipes, the Chevy had a couple of spaces between the fuel tank and the rear framerails that were perfect for tucking the pipes up and out of the way. Josh grabbed the rear portions of the over-the-rear pipes and held them up to see if and where they'd need to be trimmed. They needed only a slight trimming to end just where they needed to be.

As he had since the start, Josh grabbed another section of tubing from the Flowmaster kit and duplicated the tailpipe for the right side of the system too.

The final components were a pair of exhaust tips to finish the system off. Josh chose a pair of bends that he trimmed into a couple of short turndowns to add to the ends of the tailpipes that'd turn down just about at the rear bumper for a nice clean look.

The final step for this particular install was pulling the system out piece by piece so that it could be welded versus clamped together and then permanently reinstalled. In my opinion, the use of good-quality muffler clamps would be fine for a home shop fabricated system. In fact, I used this same Flowmaster kit on my wife's '27 roadster and used clamps in place of welds and it worked out just fine. This Flowmaster Dual Kit is perfect for the home hot rodder. It's affordable, easy, and yet one more phase of building a hot rod that you can perform yourself rather than paying someone else to do for you-and that's the way we like to do it.