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M T | profile | all galleries >> 240 >> 3_inch_exhaust tree view | thumbnails | slideshow
3" downpipe
3" Catco cat
3" Pacesetter flex pipe
(2) 4' lengths of 3" pipe from Summit Racing
3" Dynomax bullet muffler
(2) 45° mandrel bends from Columbia River Mandrel Bending.
(1) v-band clamp & flanges (buy ClampCo from ATP instead of the one sold by Columbia River Mandrel Bending)
3/8" round stock & rubber hangers
scrap 3" pipe, partial bends, clamps, etc.

We cut the vertical section from the downpipe and welded the flex pipe on. Welded the v-band flange to the flex and to the other side of the downpipe. Fit the downpipe on the car and began fitting the rest of the pieces. We chose to cut the downpipe after the second 90° bend and put the cat ahead of where the stock cat would have been, so it's even closer to the engine now. The pipe clears the trans cross member by about 1/2".

Many of the joints in the system were made by cutting a slight angle on the pipe to change the direction slightly, then welded back together. Don't cut all the way through, just cut out a wedge and bend it together to close the gap to create a slight bend.

The first 4' section of pipe was angled towards the driveshaft, then straightens to bypass a low point in the floor and get it as high as possible. It passes close to the driveshaft under the driveshaft support cross member. The first hanger is at the front of the muffler and hangs from one of the factory threaded holes.

After the muffler is a short piece of scrap pipe followed by the two 45's that get the exhaust around the gas tank. With the car on a lift, we supported the axle and lowered the car, then built the exhaust so it touched the axle. At full droop, the axle pulls slightly on the exhuast, but it's got ample clearance with the tires on the ground. The Bilsteins are ~1" shorter in droop than off the shelf HDs. Another piece of straight pipe threads between the gas tank and the spare tire well, then the second hanger for the tailpipe section on a stock rear muffler mount. Finally, a turn down tip cut from a piece of scrap exits just past the bumper.

The entire exhaust is welded together...no clamps or slip joints. It doesn't buzz, vibrate, or hit the body...ever. Yet it's tucked extremely close to the body for maximum ground clearance. Sound is deep at idle, and with a little droning at low RPM/low speed. But at speed it sounds good and isn't as loud as I might have expected. I'm extremely happy with how it turned out. We spent a full day on it because each piece was hand fit, so it does take time to get it right.
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