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The Datsun 1200 used a 1-1/2 inch exhaust system. The cast iron exhaust manifold has a flat two-bolt flange. A donut-type asbestos seal was used to connects to the exhaust pipe, which extended past the rear axle. Finally a very, very quiet muffler with a short tail pipe was suspended by two rubber rings.

1 Overview
2 Sizing for Performance
3 Options
4 Coupe vs. Sedan
5 Part Numbers

Overview

muffler with integrated pipe
Bottom (old) is the factory piece

A12GX Engine (twin carb) models used a quieter exhaust with a small resonator as well the regular muffler:

Notice it also used a cast header with dual outlets.

Sizing for Performance

A large diameter exhaust pipe is needed for maximum high-rpm horsepower. However, a small diameter pipe is needed for low-rpm horsepower. So you can see that a properly sized pipe -- not too big or too small -- is advantageous.

Single Exhaust

Stock 62 horsepower A10: 35mm (~1-3/8")
Stock 68/69 horsepower A12: 1-1/2" (38mm)
lightly modded A-series engine: 1-3/4"
Max fuel econdomy: 1.5"
90 hp engine: 1.75"
100 hp engine: 2"
150 hp engine: 2-1/4"
200 hp engine: 2-1/2"

Of course you can vary this. For example:

The larger the engine relative to your car, you can get away with a larger pipe. Although the larger pipe cuts down on low-rpm horsepower you have a big engine so it's not so bad. This increases high-rpm (peak) horsepower
For better street driveability, go a size smaller
For drag racing where it is flat-out full throttle, a larger size may work fine

2.5 inch

Options

Muffler system with resonator
Chrome tailpipe extension (bell-shaped)

Coupe vs. Sedan

coupe muffler

The bends are slightly different.
The hanger near the end of the tailpipe (in the photo: where the price tag is) is a different place for sedan vs coupe

Part Numbers

Muffler measurements from my car (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

A muffler about 2" longer may fit.

Nissan JDM Catalog

20010-H1000 TUBE ASS'Y-exhaust, front - ALL (exc. GX, Automatic)
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
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 (formerly 20010-H1000) $34.92
20100-H7001 ASSY-MUFFLER WITH REAR TUBE Sedan Manual Trans (formerly 20100-H1000) $84.72 NLA (but is in 2007 catalog)
20321-H2000 FINISHER-EXHAUST (chrome extension) NLA
20321-H2500 FINISHER-EXHAUST (chrome extension) $18.36 NLA (but is in 2007 catalog)

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

Aftermarket 1.75

Walker Super Turbo WLK-17771
WALKER Pro-Fit Muffler, 1.75" offset/center, #17881
Dynomax 17771
Magnaflow 11123 with offset Might be too long, it is 14" body, but it is Stainless Steel, best buy
Borla XR-1 BOR-40483 Stainless Steel, 1.75 in, 2.25 out

USA

B110 RAW PARTS LIST
20010-H3100 ASSY-TUBE EXHAUST FRONT
20010-H1020 ASSY-TUBE,EXHAUST,FRONT
20010-H3200 ASSY-TUBE EXHAUST FRONT
20010-H1000 ASSY-TUBE EXHAUST FRONT
20602-27700 NUT-FIXING TUBE END
14011-29901 NUT-FIXING TUBE END
20635-18000 STOPPER-MUFFLER BOUND
20100-H1000 ASSY-MUFFLER WITH REAR TUBE
20100-H7001 ASSY-MUFFLER WITH REAR TUBE
20100-H1800 ASSY-MUFFLER WITH REAR TUBE
20100-H2500 ASSY-MUFFLER WITH REAR TUBE
20100-H7101 ASSY-MUFFLER WITH REAR TUBE
20630-V0100 RING-RUBBER MUFFLER CLAMP
20630-P4400 RING-RUBBER MUFFLER CLAMP
20630-18000 RING-RUBBER MUFFLER CLAMP
20643-B5000 CLIP-TUBE EXHAUST
20620-H1000 CLIP-TUBE EXHAUST
08915-43810 WASHER-PLAIN M8
08915-13810 WASHER-SPRING M8
08110-86010 BOLT-HEX M8
08911-10810 NUT-HEX M8
20640-18000 STRAP-EXHAUST HANGER
42013-0101P STRAP-EXHAUST HANGER
20641-18000 WASHER-PLAIN EXHAUST
08911-10810 NUT-HEX M8
08915-13810 WASHER-SPRING M8
08110-82210 BOLT-HEX M8
20321-H2000 FINISHER-EXHAUST
20321-H2500 FINISHER-EXHAUST
20720-N2226 KIT-SEALANT,EXH TUBE JOINT
20720-N2225 KIT-SEALANT,EXH TUBE JOINT

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Exhaust Piping

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