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Overview

Exhaust Pipe, Muffler, Tail Pipe
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Original mufflers came with integrated exhaust pipe - Bottom (old) is the factory piece. This pipe was part of the muffler.
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The muffler should flow at least 2.2 cfm per flywheel HP. For a 69 hp A12, that is 152 cfm, easily achieved with the factory 1-1/2 inch piping.

Muffler is located just in front of the Rear Axle
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Coupe & Sedan have the same muffler location, only the bend shape of the tailpipe portion differs a little. This bend allows the pipe to go over the rear axle.
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The body of the muffler is suspended by two rubber rings and contributes to quietness of the exhaust system (there are no rattles from the exhaust).
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Tailpipe exits at the rear, below the bumper
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Size

Muffler measurements from my 1200 sedan with factory original muffler:

* 11-5/8" Shell length
* 8-1/4" Shell oval width
* 3-3/4" Shell oval height
* 1.5" front inlet, centered
* 1.5" rear outlet, on far left of oval

There is enough room under a sedan that a muffler about 2" longer may fit.

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Part Numbers

Nissan JDM Catalog
20010-H1000 TUBE ASS'Y-exhaust, front - ALL (exc. GX, Automatic)
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20010-H1020 TUBE ASS'Y-exhaust, front - Automatic
20010-H2301 TUBE ASS'Y-exhaust, front - GX 4-speed
20010-H3400 TUBE ASS'Y-exhaust, front - GXA (GX Automatic)
20010-H7200 TUBE ASS'Y-exhaust, front - GX-5
20603-H2300 GASKET-exhaust tube - GX and GX-5
20602-27700 NUT-fixing, tube end (2) - ALL (except GX, GX-5)
20602-27700 NUT-fixing, tube end - GX-5
08915-13810 WASTHER-spring lock (3) - GX-5
20635-18000 STOPPER-muffler bound - ALL
20100-H1000 MUFFLER ASS'Y-with rear tube - Sedan
20100-H1400 MUFFLER ASS'Y-with rear tube - Van
20100-H2500 MUFFLER ASS'Y-with rear tube - Coupe
20630-18000 RING-rubber, muffler clamp (2)
20620-H1000 CLIP-tube, exhaust

06915-43810 WASHER-plain (2)
08915-13810 WASHER-lock
08110-85510 or 08110-86010 BOLT
08911-10810 NUT
20640-18000 STRAP-exhaust hanger
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20641-18000 WASHER-plain (2)
08911-10810 NUT (2)
08915-13810 WASHER-lock (2)
08110-82210 BOLT (2)
20321-H2500 FINISHER-exhaust - GL, GX
20720-N2225 SEALER KIT-exhaust tube joint - ALL

USA Catalog
20010-H3100 ASSY-TUBE EXHAUST FRONT Sedan Manual Trans > 20010-H1000 $34.92
20100-H7001 ASSY-MUFFLER WITH REAR TUBE Sedan Manual Trans > 20100-H1000 $84.72 NLA
20321-H2000 FINISHER-EXHAUST (chrome extension) NLA
20321-H2500 FINISHER-EXHAUST (chrome extension) $18.36 NLA

A15E EGI dual exhaust (92 hp). This one has been modified to remove muffler
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Aftermarket Replacements

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Aftermarket 1.5

Dynomax 17700 ("Thrush turbo"),similar shape to stock. Oval 3.25 in. x 7.75 in. Case Length: 11 in. Overall length: 16 in. Width: 7.750 in. Thickness: 3.25 in.

1-1/2 pipe clamps:
* Merit M112 or U112
* Napa BK 7335325

Rubber Donut Hangers
* Merit 8166 ???

Aftermarket GX (is it the same as the S110 gasket?)
* Gasket: Merit 8696
* Pipe: (1981 Nissan 720), Merit 48316

Exhaust Tip - 1-1/2" diameter
* Merit 9821

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Aftermarket 1.75

Walker Super Turbo WLK-17771ᴳ
Walker SoundFX 17909ᴳ 1.75" in/out 14x6.65 round case
Dynomax 17771, 160 cfm
Walker 17881 Pro-Fitᴳ, 1.75" offset/center
Magnaflow 11123ᴳ with offset. Might be too long, it is 14" body, but it is Stainless Steel, best buy $123 in 2021
Borla XR-1: BOR-40483ᴳ Stainless Steel, 1.75 in, 2.25 ex, 13x4.5 round case, turn-down outlet

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Can Muffler

Hot-dog style mufflers (cannons or "fart cans") are mainly for looks. Having the muffler at the very end of the exhaust makes it louder, and most cans are fiberglass packed tubes ("glass-pack") which are by nature noisy. They are simply a straight-through pipe with baffles in the tube sides.

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When fitting a can muffler, it is advised to also fit a large normal muffler under the car.
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Dual Outlet

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Arms

http://www.arms-eng.com

ARMS - stainless side tubes to fit 1200 ute. Volume 94db. Main pipe φ50, tail end φ50 (2" pipes). Dual slash cut or straight cut.

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Nismo

"FISCO" and "NISMO" was fitted to Sunny Truck with A15

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Finish Mufflers

Add a stylish stainless steel muffler at the end of a full exhaust system.

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rotary style dumpy
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straight-through "cannon" muffler (a straight pipe, peforated with holes and fiberglass-packed chamber) is VERY loud
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